Bloodletter’s Curse

What is Bloodletter’s Curse? đŸ§Ș

Bloodletter’s Curse is the sustained ability-spam mage’s MR shredding item — a 2,900 gold legendary that combines AP, AH, and HP with a stacking magic resistance reduction passive. The VILE DECAY passive rewards AP champions who deal magic damage repeatedly across a fight, progressively stripping the target’s magic resistance with each ability hit. At 4 stacks, VILE DECAY reduces the target’s MR by 30% — a multiplicative magic pen equivalent that applies before flat magic pen calculations and substantially amplifies total magic damage dealt across all sources.

The item sits in the BLIGHT exclusivity group alongside Cryptbloom and Void Staff — only one BLIGHT item can be held at a time. The choice between them defines the mage’s magic penetration identity: Bloodletter’s Curse for ability-spam sustained magic damage who can reliably stack VILE DECAY to 4 within each fight, Void Staff for maximum flat 40% magic pen regardless of ability frequency, and Cryptbloom for mages who want 30% magic pen plus the LIFE FROM DEATH kill-based team heal.

The first-hit non-benefit rule is VILE DECAY’s most critical mechanical distinction: the first magic damage instance applied to an enemy champion does not benefit from VILE DECAY’s MR reduction. The damage is calculated at the target’s current MR before the stack is applied, and the stack is added after. This means Bloodletter’s Curse requires multiple hits to realise full value — the magic pen benefit activates from the second hit onward, with maximum 30% reduction reached only after 4 stacking hits land. Champions who deal single-instance burst (one large spell) gain minimal VILE DECAY value compared to sustained multi-hit ability spammers.

VILE DECAY — MR Reduction Stacking Math and Damage AmplificationMR reduction per stack: 7.5% → Maximum: 30% at 4 stacks.Stack duration: 6 seconds per stack (refreshes on each new stack application).Stack rate: up to once per basic attack or ability per cast instance every 0.3 seconds.Effective MR reduction value by stack count (target at 100 MR):0 stacks (baseline 100 MR): 100 / (100 + 100) = 50% magic damage reduction. Champion takes 50% of magic damage.1 stack (7.5% MR reduction → 92.5 effective MR): 92.5 / 192.5 = 48.1% reduction. +1.9% more magic damage taken vs baseline.2 stacks (15% MR reduction → 85 effective MR): 85 / 185 = 45.9% reduction. +4.1% more magic damage taken vs baseline.3 stacks (22.5% MR reduction → 77.5 effective MR): 77.5 / 177.5 = 43.7% reduction. +6.3% more magic damage taken vs baseline.4 stacks / max (30% MR reduction → 70 effective MR): 70 / 170 = 41.2% reduction. +8.8% more magic damage taken vs 100 MR baseline. At max stacks, the target takes 58.8% of magic damage (vs 50% without VILE DECAY).Against 150 MR (tank with MR items):0 stacks: 150 / 250 = 60% reduction (takes 40% of magic damage).4 stacks (30% → 105 effective MR): 105 / 205 = 51.2% reduction. Takes 48.8% vs 40% — +8.8 percentage points improvement. In absolute terms on 500 AP ability: 500 × (0.488 − 0.400) = +44 bonus damage per ability at max VILE DECAY vs 0 stacks against 150 MR.First-hit penalty — critical reminder: The FIRST magic damage instance against the target does NOT benefit from any VILE DECAY reduction — damage is calculated at current MR, THEN stack is applied. Every subsequent hit benefits from accumulated previous stacks. Maximum 30% reduction is only active from hit 5 onward (hit 1 applies stack 1; hit 2 benefits from stack 1; hit 4 applies stack 4; hit 5+ benefits from all 4 stacks).

📊 Base Statistics

StatisticValue
Total Cost2,900 gold
Combine Cost750 gold
Sell Price2,030 gold
Ability Power+65 AP
Ability Haste+15 AH
Health+400 HP
VILE DECAY: TriggerDealing magic damage to enemy champion with a champion ability
VILE DECAY: Stack application rateUp to once per basic attack or ability per cast instance every 0.3 seconds
VILE DECAY: Max stacks4 stacks
VILE DECAY: Stack duration6 seconds per stack
VILE DECAY: Effect per stack7.5% magic resistance reduction
VILE DECAY: Max MR reduction30% at 4 stacks
VILE DECAY: First-hit ruleFirst magic damage instance does NOT benefit from VILE DECAY’s MR reduction — damage calculated first, debuff applied after
VILE DECAY: Spell shieldVILE DECAY (the debuff application) is NOT blocked by spell shield
VILE DECAY: Stack sequenceEach damage instance only benefits from MR reduction of previously accumulated stacks, not the stack applied by that same hit
Item limitLimited to 1 BLIGHT item (exclusive with Cryptbloom and Void Staff)
Item ID8010
AvailabilitySR 5v5, ARAM, Nexus Blitz
Arena: AP60 AP (reduced from 65)
Arena: HP350 HP (reduced from 400)
Arena: MR reduction/stack7.5% (same as SR)
Arena: Max stacks4 stacks (same as SR)

đŸ—ș Map-Specific Differences — Arena

StatSR vs Arena
Ability PowerSR/ARAM/NB: +65 AP → Arena: +60 AP (−5 AP)
HealthSR/ARAM/NB: +400 HP → Arena: +350 HP (−50 HP)
Ability HasteSR/ARAM/NB: +15 AH → Arena: +15 AH (unchanged)
VILE DECAY: MR/stackSR: 7.5% → Arena: 7.5% (unchanged)
VILE DECAY: Max stacksSR: 4 stacks → Arena: 4 stacks (unchanged)
VILE DECAY: Max reductionSR: 30% → Arena: 30% (unchanged)
Arena Bloodletter’s Curse — Minor Stat Reduction, Same VILE DECAY:Arena’s version reduces AP by 5 (65 → 60) and HP by 50 (400 → 350) compared to SR. The VILE DECAY passive remains identical — same 7.5% per stack, same 4-stack maximum, same 30% total MR reduction at max stacks. For Arena’s sustained 2v2 rounds where ability-spamming mages can reliably stack VILE DECAY to 4 within the extended round duration, the passive’s value is unchanged from SR. The −5 AP marginal reduction is minimal in the context of a full AP build with 400–600 total AP.

🔹 Recipe & Components

ComponentCostNotes
Bloodletter’s Curse (Total)2,900 gold65 AP + 15 AH + 400 HP + VILE DECAY
Haunting Guise1,300 gold (500 combine)Amplifying Tome + Ruby Crystal + 500 combine; +40 AP + 200 HP at component — provides early AP + HP mid-build; the AP + HP input for Bloodletter’s Curse; Haunting Guise also builds into other AP + HP items, maintaining build flexibility before full completion
  └ Amplifying Tome400 goldAP component
  └ Ruby Crystal400 goldHP component
Fiendish Codex850 gold (200 combine)Amplifying Tome + Glowing Mote + 200 combine; +30 AP + 15 AH at component — the primary AH input; completing Fiendish Codex first provides AH for faster ability cycling before full Bloodletter’s completion; also builds into a wide range of AP items
  └ Amplifying Tome400 goldAP component
  └ Glowing Mote250 goldAH component
Combine Cost750 goldModerate combine cost; components provide meaningful mid-build stats
Sell Value2,030 gold~70% return on investment
🔑 Haunting Guise First — AP + HP Mid-Build Spike:Haunting Guise (1,300g) completed as the first component provides +40 AP and +200 HP at component stage — a substantial mid-build stopping point for AP champions who need both offensive AP and defensive HP simultaneously before full Bloodletter’s completion. The HP is particularly valuable for mages who face early all-in threats in the laning phase. Haunting Guise also maintains flexibility to build into other AP + HP items (Luden’s Tempest, Rod of Ages, Rylai’s Crystal Scepter) if the game state changes before Bloodletter’s full completion — a build redirect option that Fiendish Codex-first does not provide.

🧬 VILE DECAY — Complete Mechanics Reference

Stacking Mechanics — How VILE DECAY Builds

VILE DECAY stacks from champion abilities dealing magic damage to enemy champions. The 0.3-second rate limit prevents a single AoE cast or rapid-fire multi-hit ability from applying multiple stacks simultaneously — each cast instance can only contribute one stack every 0.3 seconds. This rate limit means rapid burst combos (Syndra R’s multiple ball throws in under 0.3 seconds) may not apply stacks at each hit’s individual timing, but ability-spam rotations with distinct 0.3+ second gaps between casts stack VILE DECAY reliably.

The 6-second stack duration refreshes on each new stack application. Against sustained ability-spam champions (Ryze with sub-second rotation, Cassiopeia E resets), VILE DECAY stacks maintain permanently as long as ability cast frequency exceeds the natural duration. Against champions with longer ability cooldowns (Viktor Q at 3+ seconds base CD), VILE DECAY may partially decay between ability casts at lower CD builds — the AH from Bloodletter’s Curse (+15 AH) directly improves ability cycling speed, partially mitigating this decay risk.

The First-Hit Rule — Most Impactful Mechanic

⚠ Critical Rule: The FIRST Magic Damage Instance Does NOT Benefit From VILE DECAYExact sequence:Hit 1 (0 stacks): Magic damage dealt at current target MR (no VILE DECAY reduction active). Stack 1 applied AFTER damage calculation. Target now has 1 stack = 7.5% MR reduction.Hit 2 (1 stack active): Magic damage benefits from 7.5% MR reduction from stack 1. Stack 2 applied after. Target now has 2 stacks = 15% MR reduction.Hit 3 (2 stacks active): Magic damage benefits from 15% MR reduction. Stack 3 applied after. Target now has 3 stacks = 22.5% MR reduction.Hit 4 (3 stacks active): Magic damage benefits from 22.5% MR reduction. Stack 4 (max) applied after. Target now has 4 stacks = 30% MR reduction.Hit 5+ (4 stacks active): Magic damage benefits from full 30% MR reduction. Maximum VILE DECAY value reached. Duration refreshes with each subsequent hit.Practical implication: A champion with a 4-ability opener (Q+W+E+R in 2 seconds) applies VILE DECAY stacks 1 through 4 during the rotation. The Q (first hit) deals damage at current MR; W benefits from stack 1’s 7.5% reduction; E benefits from stacks 1+2 (15%); R benefits from stacks 1+2+3 (22.5%). Only subsequent casts after the 4th stack is applied get the full 30% reduction. For burst mages with only one rotation, VILE DECAY’s cumulative benefit over the rotation averages approximately 15% MR reduction across the 4 hits rather than the full 30%.

VILE DECAY and Spell Shield Interaction

VILE DECAY (the debuff application) is not blocked by spell shield. When an ability is blocked by Sivir E’s Spell Shield or Nocturne W’s Shroud of Darkness, the ability’s magic damage is prevented — but the VILE DECAY stack itself still applies to the target. This means a mage whose Lux Q is blocked by Sivir E still applies one VILE DECAY stack to Sivir from the blocked ability, even though the Q’s bind damage was negated. For ability-spam mages facing spell shield champions, VILE DECAY continues accumulating through the blocked spell window.

BLIGHT Item Exclusivity — Bloodletter’s Curse vs Cryptbloom vs Void Staff

📊 BLIGHT Item Decision Framework:Three BLIGHT items, three different magic pen identities:Bloodletter’s Curse (2,900g): +65 AP, +15 AH, +400 HP. VILE DECAY: stacking 7.5% MR/stack → 30% total at 4 stacks. Value grows across a fight as stacks accumulate. Best for: sustained ability-spam mages who reliably land 4+ hits per fight (Ryze, Cassiopeia, Viktor, Malzahar, Aurelion Sol).Void Staff (2,800g): +80 AP, +25 AH. BLIGHT: flat 40% magic penetration (always active, no stacking). 100% value on the first hit. Best for: burst mages who rely on single large-damage abilities, or when the full 40% pen is more reliable than VILE DECAY’s requirement for 4 stacks (Syndra R, Veigar R, LeBlanc full combo).Cryptbloom (3,000g): +75 AP, +20 AH. BLIGHT: 30% magic penetration. LIFE FROM DEATH: kill/assist triggers a team healing nova (100 + 20% AP per champion hit). Best for: kill-confirming mages in teamfight compositions where LIFE FROM DEATH heals matter (Orianna, Seraphine, Syndra in team fights).Selection guide:Ability-spam (4+ hits per fight): Bloodletter’s Curse — 30% MR reduction > 30% Cryptbloom pen when stacks maintained; choose Cryptbloom if team healing is priority.Single-rotation burst: Void Staff — 40% flat pen on the first hit > VILE DECAY’s 0% on hit 1.Teamfight healer mage: Cryptbloom — LIFE FROM DEATH team sustain is the deciding factor.Note: Magic resistance REDUCTION (VILE DECAY) and magic PENETRATION (Void Staff, Cryptbloom) are different mechanics. MR reduction strips the target’s base MR value (benefits all magic damage dealers on the team). Magic penetration only benefits the holder’s own damage calculations. VILE DECAY’s MR reduction is a TEAM-WIDE benefit — all allies’ magic damage against the debuffed target is amplified by VILE DECAY’s reduction.

🎯 VILE DECAY as a Team-Wide Debuff

A mechanic that most players miss: VILE DECAY’s magic resistance reduction is not exclusive to the Bloodletter’s Curse holder. MR reduction modifies the target’s actual MR stat — every source of magic damage from every champion on the team deals increased magic damage to a target with active VILE DECAY stacks. At 4 stacks (30% MR reduction), the target’s AP carry, support, and jungler all deal increased magic damage to that target simultaneously.

This makes Bloodletter’s Curse particularly strong in AP-heavy compositions where multiple champions deal magic damage. A Malzahar who applies VILE DECAY to 30% MR reduction on the enemy ADC during a teamfight amplifies the damage of the allied Lux Q, Thresh AoE, and any other magic damage source hitting that target. The team-wide benefit scales with the number of AP champions on the team and the total magic damage they deal within VILE DECAY’s 6-second window.

💡 VILE DECAY MR Reduction vs Magic Penetration — Team Benefit Comparison:Void Staff 40% magic pen: Applies only to the Void Staff holder’s damage calculations. Ally AP carries do NOT benefit from the Void Staff holder’s magic pen.Bloodletter’s Curse 30% VILE DECAY MR reduction at 4 stacks: Reduces target’s MR by 30% — applies to ALL magic damage from ALL sources hitting that target. Ally mages benefit from the reduced MR.Example with Malzahar (Bloodletter’s) + Lux (ally):Target has 100 MR → 50% magic damage reduction.Malzahar stacks 4 VILE DECAY → 70 effective MR → 41.2% reduction (target takes 58.8% of magic damage).Lux Q with 500 AP damage vs 0 stacks: 500 × 0.50 = 250 effective damage.Lux Q vs 4 VILE DECAY stacks: 500 × 0.588 = 294 effective damage. +44 bonus damage to Lux’s Q from Malzahar’s VILE DECAY.In a full AP composition: Every AP champion on the team benefits from VILE DECAY’s stack on the primary target, making Bloodletter’s Curse more valuable in AP-heavy team compositions than the pure 65 AP stats suggest.

🎯 When to Build Bloodletter’s Curse

Build Bloodletter’s Curse When:

  • Playing an ability-spam mage who reliably lands 4+ magic damage hits per fight target: Ryze (E+W+Q rotation every 1–2 seconds), Cassiopeia (E resets every 0.3 seconds), Viktor (Q+W+E+R in rapid succession), Malzahar (E+W+Q sustained DoT), Aurelion Sol (Q channel continuous ticks), Rumble (Q continuous hits) — these champions reach 4 VILE DECAY stacks within 1–2 seconds of engaging. At 4 stacks, every subsequent ability hit in the fight benefits from the full 30% MR reduction, maximising VILE DECAY’s value across the entire fight duration.
  • Playing in an AP-heavy composition where the MR reduction benefits multiple allied mages: VILE DECAY’s team-wide benefit scales with allied AP dealers. In compositions with AP mid + AP support + AP jungle (e.g., Viktor + Seraphine + Amumu AP), Bloodletter’s Curse holder’s VILE DECAY amplifies every magic damage hit from all three sources. The combined team magic damage amplification from 30% MR reduction can exceed the personal damage advantage from Void Staff’s flat 40% magic pen, particularly in fights where the team deals 3,000+ total magic damage.
  • The enemy team has moderate MR (80–120) rather than stacking MR items: VILE DECAY’s 30% MR reduction provides diminishing absolute value against very high MR targets (200+ MR from Spirit Visage + Force of Nature stacking) and increasing relative value against moderate MR targets. Against 100 MR, 30% reduction brings effective MR to 70 — a meaningful reduction. Against 200 MR, 30% reduction brings effective MR to 140 — still helpful but the absolute per-hit gain is less dramatic. For enemy teams building heavy MR, Void Staff’s flat 40% pen or a combination with Shadowflame may be more impactful.
  • The item’s HP (400) supplements the mage’s survivability for a sustained fight presence: Bloodletter’s Curse’s +400 HP is notably higher than Void Staff (which provides only AP and AH). For mages who need to survive long enough to reach and maintain 4 VILE DECAY stacks in a fight — mages who dive into range, face incoming poke, or play in melee proximity — the 400 HP provides a durability buffer that Void Staff does not. If pure glass-cannon damage is the priority and survivability is handled elsewhere, Void Staff’s higher AP (+80 vs +65) may be preferable.

Consider Alternatives When:

  • Playing a burst mage who relies on one ability rotation and rarely lands 4+ hits: Veigar R (single massive hit, 1 stack), LeBlanc full combo (3–4 hits in 0.5 seconds, limited stack accumulation due to rate limit), Syndra R (rapid ball throws triggering rate limit, limited separate-hit stacking). These burst patterns generate 1–3 VILE DECAY stacks at most per rotation — the first hit doesn’t benefit from VILE DECAY at all. Void Staff’s flat 40% magic pen on every ability including the first hit is superior for single-rotation burst.
  • The enemy team has not invested in MR and VILE DECAY’s reduction is minimal: Against targets with base MR only (~50–60 MR for non-tank champions), 30% VILE DECAY reduction provides less absolute damage increase than against higher-MR targets. At 50 MR, 30% reduction brings it to 35 MR — meaningful but the damage difference is smaller than against 100+ MR targets. Against non-MR-building opponents, Shadowflame’s flat magic pen or pure AP items may provide better personal damage scaling.
  • The game requires immediate single-target kill pressure that can’t wait for stack ramp-up: VILE DECAY’s maximum value is only reached after 4 stacks accumulate — a ramp-up of at least 4 hit instances. In urgent kill situations requiring instant maximum damage (single-pick flanks, one-shot assassination windows), the delay from stack accumulation means the first rotation deals less than maximum VILE DECAY benefit. For assassin-adjacent mage builds, the combination of Shadowflame (flat magic pen + crit against low HP targets) + Void Staff may be more impactful for instant maximum damage.

đŸ‘„ Best Champions for Bloodletter’s Curse

Optimal — Ability-Spam Sustained AP Damage

  • Ryze: Overload (Q) + Rune Prison (W) + Spell Flux (E) form a rapid 3-ability rotation every 1–2 seconds with AH. Ryze’s passive Arcane Mastery chains ability casts, generating magic damage instances far more rapidly than most mages. At moderate AH, Ryze can apply all 4 VILE DECAY stacks within the first 3–4 seconds of engaging — the remaining fight duration then benefits from full 30% MR reduction on every subsequent hit. VILE DECAY’s team benefit amplifies the damage of any nearby AP carry following up on Ryze’s engage.
  • Cassiopeia: Twin Fang (E) resets on poisoned targets every 0.3–0.5 seconds — Cassiopeia’s defining ability spam mechanic directly aligns with VILE DECAY’s 0.3-second stack rate limit. Each Twin Fang hit applies one VILE DECAY stack; at the maximum rate, Cassiopeia reaches 4 stacks in approximately 1.2 seconds from first hit. The no-boots passive amplifies the value of Bloodletter’s Curse as a gold-efficient AP + HP + AH item when the freed boots slot provides a 6th item. VILE DECAY’s team-wide MR reduction also benefits Cassiopeia’s poison damage since Noxious Blast (Q) deals magic damage to the debuffed target.
  • Viktor: Siphon Power (Q) + Gravity Field (W) + Death Ray (E) + Chaos Storm (R) — Viktor’s kit has multiple distinct ability casts in a fight rotation. Augmented Q, E, and R together generate 3–4 VILE DECAY stack applications in a single rotation. Chaos Storm’s continuous AoE following the target also generates hits every interval, contributing additional stacks during sustained fights. Viktor’s consistent ability damage pattern makes VILE DECAY’s 30% MR reduction available mid-fight for the E+Q follow-up hits after the initial rotation applies the first 3–4 stacks.
  • Malzahar: Malefic Visions (E) DoT ticking multiple times + Call of the Void (Q) silence wave + Void Swarm (W) voidlings + Nether Grasp (R) suppression channel. Malefic Visions spreads between targets and ticks magic damage repeatedly, generating VILE DECAY stacks on each DoT tick. During Nether Grasp R, the suppression channel makes the target unable to avoid incoming damage — a perfect window to reach and maintain 4 stacks while dealing massive sustained magic damage with full 30% MR reduction during the channel.
  • Aurelion Sol: Breath of Light (Q) channel continuous ticks + Astral Flight (W) damage + Singularity (E) continuous AoE + Falling Star (R) impact. Q’s continuous channel ticks generate VILE DECAY stacks with each magic damage tick, reaching 4 stacks rapidly during any sustained Q channel against a champion. VILE DECAY’s team-wide benefit is particularly valuable for Aurelion Sol as a teamfight-centred AoE mage whose role is to deal sustained magic damage to multiple targets — the MR reduction on the primary target benefits the rest of the team’s follow-up.
  • Rumble: Flamespitter (Q) continuous AoE channel + Scrap Shield (W) + Electro Harpoon (E) double cast + The Equalizer (R) ground fire AoE. Q’s flame channel applies magic damage multiple times per second, reaching 4 VILE DECAY stacks within the first Q channel against a stationary or engaged target. Equalizer ground fire during teamfights applies VILE DECAY stacks to every champion standing in the fire, though the team-wide debuff benefit requires enemies to remain in the AoE.
  • Mordekaiser: Obliterate (Q) + Indestructible (W) + Death’s Grasp (E) + Realm of Death (R) isolation. Mordekaiser’s melee range sustained fight pattern — auto-attacking and using abilities in the isolated Death Realm — generates consistent magic damage instances throughout the fight. In Death Realm isolation, VILE DECAY stacks maintain at 4 due to Mordekaiser’s sustained damage output, and the full 30% MR reduction applies to all magic damage in the 7-second isolation window. The 400 HP from Bloodletter’s Curse also supplements Mordekaiser’s naturally durable frontline presence.
  • Brand: Sear (Q) stun + Pillar of Flame (W) + Conflagration (E) + Pyroclasm (R) bouncing fireball. Brand’s Blaze (P) passive explodes with bonus magic damage at 3 stacks — VILE DECAY stacks accumulate across the Q+W+E sequence, with the P explosion at Blaze maximum benefiting from the MR reduction applied by the previous ability hits. The Pyroclasm R bouncing fireball hits multiple targets, applying VILE DECAY to each champion hit by each bounce.

Situational

  • Vladimir: Transfusion (Q) + Sanguine Pool (W) + Tides of Blood (E) + Hemoplague (R). Vladimir’s R Hemoplague amplifies all damage to affected targets by 10% — combined with VILE DECAY’s 30% MR reduction, enemies under both Hemoplague and 4-stack VILE DECAY take substantial amplified magic damage. Situational because Vladimir builds AP + HP items primarily, and Bloodletter’s Curse (65 AP + 400 HP) competes with Rod of Ages (90 AP + 400 HP ramp) or other higher-AP options for the BLIGHT slot.
  • Lissandra: Ice Shard (Q) + Ring of Frost (W) + Glacial Path (E) + Frozen Tomb (R). Short cooldown abilities enable VILE DECAY stacking, and the R self-cast invulnerability window makes Lissandra a sustained fighter in melee range. Situational — Lissandra’s burst pattern means Void Staff can be more reliable for burst windows, while Bloodletter’s Curse suits the sustained 4-stack scenario.

Not Recommended

  • Single-rotation burst mages (Veigar, LeBlanc, Zoe): These champions rely on landing maximum damage in one rotation and rarely cycle abilities frequently enough to maintain 4 VILE DECAY stacks. The first-hit non-benefit rule means the opening burst — which is often the only full rotation — gets minimal VILE DECAY value. Void Staff (flat 40% pen on all hits including the first) is strictly better for one-rotation champions.
  • Pure physical AD builds: VILE DECAY reduces magic resistance, which does not affect physical damage. Physical damage dealers gain nothing from MR reduction.

⚙ Recommended Build Paths

Viktor — Sustained AP Rotation Build

  1. Amplifying Tome — Game start (400g): early AP for laning Q empowerment
  2. Haunting Guise — First back (1,300g): +40 AP + 200 HP spike; Haunting Guise provides AP + HP before full Bloodletter’s completion
  3. Bloodletter’s Curse — First full item (2,900g): VILE DECAY active from first Q+E+W rotation; 4 stacks reached mid-rotation; 30% MR reduction on subsequent hits; 400 HP for melee-proximity fight survival
  4. Shadowflame — Second item: CINDERBLOOM: magic pen vs low-HP targets + critical magic damage on abilities; +110 AP; flat magic pen after VILE DECAY % reduction = maximum effective magic pen on low-HP carries
  5. Rabadon’s Deathcap — Third item: ZEAL: +30% total AP amplification; 65 AP from Bloodletter’s + Shadowflame AP all amplified by Rabadon’s; total AP reaches 500+ with full build
  6. Zhonya’s Hourglass — Fourth item: STASIS active 2.5s invulnerability; armor + AP + AH; STASIS during Viktor’s Chaos Storm R follow-up — activating STASIS after landing R keeps Viktor safe while the storm follows the primary target
  7. Void Staff — Fifth item: NOTE: Cannot hold alongside Bloodletter’s Curse — both are BLIGHT items. This is listed as an alternative build direction only. In practice, the 5th slot would use a non-BLIGHT AP item: Banshee’s Veil (MR + AP + spell shield), Cosmic Drive (AP + HP + movement speed), or Cryptbloom (if selling Bloodletter’s for higher-pen final build — advanced decision)

Cassiopeia — Sustained DoT Mage Build

  1. Amplifying Tome — Start: AP for Q damage enhancement
  2. Fiendish Codex — First back (850g): AH for faster E Twin Fang reset frequency; Cassiopeia’s ability frequency is the core of VILE DECAY stacking — every point of AH increases Twin Fang reset speed
  3. Bloodletter’s Curse — First full item (2,900g): 15 AH supplements Fiendish Codex AH from earlier; E Twin Fang at high frequency stacks VILE DECAY to 4 within ~1.2 seconds; VILE DECAY at full stacks during sustained fight phases
  4. Rylai’s Crystal Scepter — Second item: RIMEFROST: 30% slow on every ability hit; AP + HP; each E Twin Fang hit slows the target by 30% for 1 second, chaining slows across rapid E resets — effectively pseudo-roots the target throughout the rotation; VILE DECAY stacks apply on each slow-hit
  5. Rabadon’s Deathcap — Third item: AP amplification peaks
  6. Shadowflame — Fourth item: flat magic pen vs low-HP targets at end of Cassiopeia’s rotation
  7. Zhonya’s Hourglass — Fifth item: survival during prolonged melee-proximity fights where Cassiopeia sustains VILE DECAY stacks
💡 Bloodletter’s Curse + Rylai’s Crystal Scepter — Sustained Fight Control:Rylai’s Crystal Scepter‘s RIMEFROST applies a 30% slow for 1 second on every ability hit. For ability-spam mages who cast abilities every 0.3–1 second (Cassiopeia E, Viktor Q+E rotation, Malzahar W ticks), the result is near-permanent 30% slow on the primary target throughout the fight.Combined with VILE DECAY: The target is simultaneously slowed by 30% (can’t escape) and debuffed with 30% MR reduction (takes amplified magic damage). Every magic damage hit from the sustained rotation applies both effects — the target is pinned in position AND taking increased magic damage from the Bloodletter’s Curse holder and all allied AP sources.Cost-efficient combo: Bloodletter’s Curse (2,900g) + Rylai’s (2,600g) = 5,500 gold for AP + HP + AH + VILE DECAY MR shred + sustained 30% slow. This two-item core provides both offensive (MR reduction) and crowd control (movement impairment) from the same sustained-damage pattern that drives both passives.

🔄 Similar Items — Magic Penetration & AP Family

ItemProfilevs. Bloodletter’s Curse
CryptbloomBLIGHT item (exclusive with Bloodletter’s); +75 AP, +20 AH; BLIGHT: 30% magic pen; LIFE FROM DEATH: kill/assist triggers team heal (100 + 20% AP)Same BLIGHT group — cannot hold both. Cryptbloom for 30% flat magic pen (first hit benefits) + kill-based team healing. Bloodletter’s Curse for 30% MR reduction that builds to full and benefits the whole team. Choose Cryptbloom if kill confirmation + heal matters; Bloodletter’s if team-wide AP amplification and ability-spam stacking are stronger
Void StaffBLIGHT item (exclusive with Bloodletter’s); +80 AP, +25 AH; BLIGHT: 40% magic penetration (flat, always active from first hit); no HPSame BLIGHT group — cannot hold both. Void Staff for burst mages who need 40% pen on the first hit. Bloodletter’s for sustained ability-spammers who reach 4 stacks quickly. Void Staff provides higher AP (+80 vs +65) but no HP. If reliably reaching 4 VILE DECAY stacks, Bloodletter’s 30% MR reduction > Void Staff’s 40% pen for team-wide impact
Liandry’s Torment+90 AP, +300 HP; TORMENT DoT: 1.5% target’s max HP magic damage per second (enhanced to 3% during immobilisation); SUFFERING: +10% bonus magic damage on abilitiesNon-BLIGHT — can be held alongside Bloodletter’s Curse. Liandry’s DoT stacks WITH VILE DECAY’s MR reduction: every Liandry’s tick against a VILE DECAY-debuffed target benefits from the reduced MR. Strong combination for HP-scaling tank matchups where both Liandry’s % HP damage AND VILE DECAY MR reduction are valuable simultaneously
Morellonomicon+65 AP, +15 AH, +300 HP; GRIEVOUS WOUNDS: 40% GW on ability damage to championsNon-BLIGHT — can be held alongside Bloodletter’s Curse. Similar AP + AH + HP stat profile to Bloodletter’s. Morellonomicon for anti-heal (GW) vs Bloodletter’s for MR reduction. Both items serve different utility functions alongside the mage’s damage; consider which debuff (GW vs MR reduction) is more impactful for the current matchup
Abyssal Mask+30 MR, +350 HP, +300 mana, +15 AH; UNMAKE: −20% MR aura to nearby enemiesNon-BLIGHT — can be held alongside Bloodletter’s Curse. Both reduce nearby enemies’ MR, but through different mechanics: Bloodletter’s VILE DECAY reduces MR % per stack (ability-hit sourced), Abyssal Mask UNMAKE is a flat proximity aura. Stacking both creates a powerful combined MR reduction: VILE DECAY 30% + UNMAKE 20% simultaneously on the same target
Shadowflame+110 AP, +15 AH; CINDERBLOOM: magic pen vs shields and low-HP targets; no HPNon-BLIGHT — ideal second or third item alongside Bloodletter’s Curse. Shadowflame’s flat magic pen against low-HP targets stacks multiplicatively with VILE DECAY’s % MR reduction: % reduction first (VILE DECAY reduces target’s effective MR), then flat pen subtracts. The combo delivers the highest effective magic pen from the mage side on any target below 35% HP
💡 Bloodletter’s Curse + Abyssal Mask — Double MR Reduction Stack:Both VILE DECAY and Abyssal Mask’s UNMAKE reduce the target’s magic resistance, but through different mechanics that can stack simultaneously:Abyssal Mask UNMAKE: −20% MR flat aura to all nearby enemies (always active while in range, no stacking required).Bloodletter’s Curse VILE DECAY at 4 stacks: −30% MR from ability-damage stacking.Combined MR reduction: On a target with 100 MR base, with both UNMAKE and 4-stack VILE DECAY active: 100 − 20% − 30% = 100 × 0.80 × 0.70 = 56 effective MR. At 56 effective MR: 56/156 = 35.9% magic damage reduction (vs 50% at 100 base MR). The target takes 64.1% of magic damage vs 50% without any reduction — a 28% damage amplification.Who benefits: Typically Abyssal Mask is held by a tank support or AP tank (Amumu, Galio, Kayle), while Bloodletter’s Curse is held by the AP carry mid. In AP-heavy compositions where both roles are filled, the combined MR reduction stack is the most powerful magic damage amplification framework available from items.

❌ Common Mistakes & How to Avoid Them

  • Expecting VILE DECAY to amplify the very first ability hit: The first magic damage instance against a target does not benefit from VILE DECAY reduction — the stack is applied after damage calculation, so hit 1 deals damage at base MR. This is the most common mechanical misunderstanding about Bloodletter’s Curse. The practical consequence: opening abilities in a combo deal slightly less than subsequent hits. Against burst targets where the opening ability needs maximum damage (Syndra R into an already-low HP target), Void Staff’s flat pen on the first hit is superior.
  • Building Bloodletter’s Curse on burst mages who rely on single-rotation combos: Veigar R, LeBlanc full combo, Zoe Q sleep detonation — these abilities deal massive damage in one hit or a rapid sub-second sequence. The 4-stack ramp-up for full VILE DECAY benefit requires multiple distinct hits at 0.3-second intervals. A champion who deals 90% of their damage in a 0.5-second burst window reaches maximum 2–3 stacks before the burst has already landed, benefiting from only 1–2 stacks of MR reduction across most of the damage. Void Staff’s flat 40% pen from the first hit is better.
  • Not accounting for the BLIGHT exclusivity with Cryptbloom and Void Staff: A build that includes both Bloodletter’s Curse and Void Staff results in only one BLIGHT passive being active — the second purchased BLIGHT item’s passive is inactive. Evaluate the BLIGHT choice at item 1 purchase and don’t accidentally add a second BLIGHT item mid-game without selling the first.
  • Ignoring the team-wide MR reduction benefit when evaluating VILE DECAY’s value: Bloodletter’s Curse is consistently undervalued by players who evaluate it only through personal damage lens. VILE DECAY’s 30% MR reduction applies to ALL allied magic damage against the debuffed target. In AP-heavy compositions, the team-wide benefit can add 50–100+ effective bonus damage per allied ability cast against VILE DECAY targets — an offensive contribution that doesn’t show up in personal post-game damage stats but meaningfully contributes to kills.
  • Not stacking Abyssal Mask with Bloodletter’s Curse in AP-heavy compositions: If a teammate is building Abyssal Mask (common on AP tanks and support mages), UNMAKE’s −20% MR reduction stacks multiplicatively with VILE DECAY’s −30%. The combined reduction is the most powerful MR debuff framework available to mage compositions. Coordinate with teammates building Abyssal Mask to maximise this stacking — the AP carry mid builds Bloodletter’s, the tank or support builds Abyssal Mask, and every ability against the primary target benefits from both simultaneously.

✅ Best Practices

  • Open fight rotations with rapid ability sequences to reach 4 VILE DECAY stacks as quickly as possible: The faster 4 stacks accumulate, the more of the fight’s total magic damage benefits from the full 30% MR reduction. Champions with rapid multi-ability openers (Viktor Q+E+W in 1.5 seconds, Malzahar E+W+Q in 2 seconds) should prioritise landing all abilities in the fastest possible sequence at the start of each engagement to maximise how much subsequent damage receives the full reduction.
  • Choose Haunting Guise as the first component purchase for early AP + HP in difficult matchups: Against lane opponents who threaten all-in damage (assassins, early AD bruiser supports), Haunting Guise’s +200 HP at 1,300 gold provides survival padding alongside its +40 AP. This component-level defensive option is not available through Fiendish Codex first (which provides AH but no HP). In safer matchups where ability cycling is the priority, Fiendish Codex first accelerates VILE DECAY stacking through faster ability cooldowns.
  • Pair with Rylai’s Crystal Scepter for a sustained fight control combination: Rylai’s 30% slow from every ability hit synergises directly with Bloodletter’s Curse’s stacking mechanic — the same ability hits that apply VILE DECAY stacks also apply the slow. Against targets who attempt to disengage from ability-spam mages, the slow prevents escape while VILE DECAY stacks maintain. The combined AP + HP + AH + VILE DECAY + slow from two items (5,500 gold) creates the core sustained fight package for champions like Cassiopeia, Viktor, and Malzahar.
  • In AP team compositions, communicate VILE DECAY stacks to allies: VILE DECAY’s MR reduction benefits all magic damage dealers on the team, but allies may not be aware of when 4 stacks are active. In organised play, call out when 4 VILE DECAY stacks are up on a priority target — the window where allied mages should unleash maximum magic damage output. Even in solo queue, understanding that your Bloodletter’s Curse buffs allied AP carries helps with fight timing and target prioritisation.
  • Do not sell Bloodletter’s Curse for Void Staff late game without evaluating VILE DECAY’s team-wide benefit: In late game where all BLIGHT items are evaluated, players sometimes consider selling Bloodletter’s Curse for Void Staff’s higher AP (+80 vs +65) and flat 40% pen. Before doing so, evaluate whether the team-wide MR reduction from VILE DECAY is more valuable than the personal damage increase from Void Staff. If the team has multiple AP champions who benefit from VILE DECAY’s MR reduction on every fight’s primary target, the team-wide amplification from Bloodletter’s Curse may outvalue Void Staff’s personal damage advantage.

🎬 Final Summary

Bloodletter’s Curse is the sustained ability-spam mage’s magic resistance destruction tool — a 2,900 gold item that progressively strips the target’s MR over 4 ability hits, reaching 30% MR reduction at maximum stacks and applying that reduction as a team-wide benefit to all magic damage sources hitting the debuffed target. The combination of accessible cost (2,900g), meaningful HP buffer (+400), AH for faster stacking (+15), and the VILE DECAY passive makes it a gold-efficient early item for mages who can reliably generate 4 ability hits per fight engagement.

The first-hit non-benefit rule and the 0.3-second stack rate limit are the two mechanical nuances that define which champions extract maximum value from Bloodletter’s Curse. Champions who deal rapid repeated ability hits (Cassiopeia E resets, Ryze Q+W+E rotation, Viktor sustained rotation) reach 4 stacks within the first 1–2 seconds of fighting, ensuring the majority of the fight’s damage benefits from the full 30% reduction. Champions who deal one large opening hit get minimal VILE DECAY benefit — and for those, Void Staff‘s flat 40% magic pen on every hit including the first is the correct BLIGHT choice.

The team-wide amplification identity — VILE DECAY reducing the target’s actual MR rather than just the holder’s magic pen — separates Bloodletter’s Curse from every other magic penetration item in the game. In AP-heavy compositions, especially when paired with Abyssal Mask‘s UNMAKE aura (stacking to combined 44%+ effective MR reduction), Bloodletter’s Curse becomes the offensive backbone of team-wide magic damage amplification — a contribution that extends well beyond what the 65 AP and 2,900 gold price tag suggest.

Key Action Items:1. Open each fight with a rapid ability sequence to reach 4 VILE DECAY stacks as quickly as possible — the faster full stacks are reached, the more of the fight’s total magic damage benefits from 30% MR reduction; ability-spam mages can achieve 4 stacks within 1–2 seconds of engaging2. Remember the first-hit non-benefit rule — hit 1 applies the first stack but deals damage at current MR with no reduction; maximum VILE DECAY benefit starts from hit 5 onward (after all 4 stacks are applied); this rule determines when Bloodletter’s Curse is better than Void Staff (4+ hits per fight) vs worse (1–3 hits per fight)3. Do not hold a second BLIGHT item alongside Bloodletter’s Curse — Cryptbloom and Void Staff are BLIGHT-exclusive; the second BLIGHT passive is inactive; choose one and build accordingly4. In AP compositions, stack with Abyssal Mask (teammate-held) for combined 44%+ effective MR reduction — VILE DECAY −30% + UNMAKE −20% simultaneously on the primary target is the strongest magic damage amplification framework available; communicate VILE DECAY stack status during fights so allied AP carries time their burst into the full 30% reduction window

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FAQ

Q: Does the first ability hit benefit from VILE DECAY’s magic resistance reduction?

A: No — the first magic damage instance against a target does not benefit from VILE DECAY’s MR reduction. The sequence is: damage calculated at current MR → first stack applied after. The second hit benefits from stack 1 (7.5% reduction), the third from stacks 1+2 (15%), the fourth from stacks 1+2+3 (22.5%), and maximum 30% reduction only benefits hits 5 and beyond. This is why Bloodletter’s Curse is strongest on ability-spam champions who deal many hits per fight — the first-hit penalty is amortised across many subsequent hits.

Q: Does VILE DECAY’s MR reduction benefit only the Bloodletter’s Curse holder or the whole team?

A: The whole team. VILE DECAY reduces the target’s actual magic resistance stat — not just the holder’s magic penetration. Every source of magic damage from every allied champion hitting the VILE DECAY-debuffed target benefits from the reduced MR. In AP-heavy compositions, this team-wide amplification is Bloodletter’s Curse’s most distinctive advantage over Void Staff (which only benefits the holder’s personal magic pen calculations).

Q: Can I hold Bloodletter’s Curse alongside Void Staff?

A: No — both are BLIGHT items, and only one BLIGHT item can be held simultaneously. Holding both results in one passive being inactive (the second purchased). Choose the correct BLIGHT item for the matchup at item purchase time: Bloodletter’s Curse for sustained ability-spam (4+ hits per fight), Void Staff for burst mages or maximum flat pen, Cryptbloom for kill-confirmation + team healing.

Q: Is VILE DECAY blocked by spell shields (Sivir E, Nocturne W)?

A: VILE DECAY itself is not blocked by spell shield. When a spell shield blocks an ability’s damage, the VILE DECAY stack still applies to the target from that blocked ability. The damage is prevented, but the MR reduction debuff stack lands regardless. This means ability-spam mages continue accumulating VILE DECAY stacks even during spell shield windows, ensuring the stacking progression is not interrupted by Sivir or Nocturne spell shield usage.

Q: How quickly does an ability-spam champion reach 4 VILE DECAY stacks?

A: The theoretical minimum with the 0.3-second stack rate limit is 4 × 0.3 = 1.2 seconds for 4 stacks (applying one stack every 0.3 seconds continuously). In practice, ability cast times and sequences mean 1.5–3 seconds is typical for reaching 4 stacks from a sustained ability rotation. Cassiopeia E resets approach the theoretical minimum; Viktor’s Q+W+E sequence reaches 4 stacks in approximately 2 seconds at moderate AH; Ryze’s E+W+Q rotation chains to 4 stacks in approximately 1.5–2 seconds.

Q: Does VILE DECAY stack with Abyssal Mask’s UNMAKE aura?

A: Yes — VILE DECAY (MR reduction from Bloodletter’s Curse) and UNMAKE (−20% MR aura from Abyssal Mask) both reduce the target’s magic resistance and stack multiplicatively. Against a 100 MR target with both full VILE DECAY (−30%) and UNMAKE (−20%) active: 100 × 0.70 × 0.80 = 56 effective MR. The combined reduction from both items represents the strongest magic damage amplification framework available in the current item system for coordinated AP compositions.

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Bloodletter’s Curse