{"id":17579,"date":"2026-02-18T14:44:21","date_gmt":"2026-02-18T14:44:21","guid":{"rendered":"https:\/\/magicstark.cz\/wiki\/stormsurge\/"},"modified":"2026-02-25T14:21:40","modified_gmt":"2026-02-25T14:21:40","slug":"stormsurge","status":"publish","type":"wiki","link":"https:\/\/magicstark.cz\/en\/wiki\/stormsurge\/","title":{"rendered":"Stormsurge"},"content":{"rendered":"\n

Stormsurge<\/strong> is a 2800-gold Legendary mage item<\/strong> providing +90 AP<\/strong> (SR base; see Arena differences), +15 magic penetration<\/strong>, and +6% movement speed<\/strong> (SR base). Its two-stage passive delivers a delayed lightning execute: STORMRAIDER<\/strong> triggers when the carrier deals damage equal to 25% of an enemy champion’s maximum health within 2.5 seconds<\/strong>, inflicting the target with Squall<\/strong> (30-second cooldown starting on Squall’s application). SQUALL<\/strong> then fires 2 seconds later<\/strong> as a lightning strike dealing 125 (+ 10% AP) magic damage<\/strong> (SR values). If the target dies before the 2-second lightning fires<\/strong>: the Squall emits an electric field instantly<\/strong>, shocking all enemy champions in a 600-unit radius<\/strong> for the same damage. Arena modified values<\/strong>: AP 90 (same), MS 4% (down from 6%), SQUALL base damage 180 (up from 125), SQUALL AP ratio 30% AP (up from 10% AP). SQUALL deals area damage and triggers spell effects<\/strong>. SQUALL is auto-targeted<\/strong>. The range modifier for SQUALL is calculated at the moment Squall is applied<\/strong>, not when the lightning fires 2 seconds later. Stormsurge is the anti-burst-survival mage item<\/strong> \u2014 STORMRAIDER rewards burst combos that chunk enemies for 25%+ max HP, and SQUALL’s 2-second delay creates a death clock<\/strong> on enemies who can’t heal 25% max HP in under 2 seconds. The on-death AoE electric field makes Squall valuable even when the target escapes \u2014 it fires instantly from the escaping champion’s position at the moment of their death.<\/p>\n\n\n\n

\ud83d\udcca Stats \u2014 SR vs Arena Comparison<\/strong><\/h2>\n\n\n\n
Stat<\/strong><\/td>SR Base<\/strong><\/td>Arena<\/strong><\/td>Change<\/strong><\/td><\/tr>
Ability Power<\/td>+90 AP<\/td>+90 AP<\/td>No change \u2014 same in Arena<\/td><\/tr>
Magic Penetration<\/td>+15 magic pen<\/td>+15 magic pen<\/td>No change<\/td><\/tr>
Movement Speed<\/td>+6% MS<\/td>+4% MS<\/td>Arena reduces MS by 2%<\/td><\/tr>
SQUALL Base Damage<\/td>125 magic damage<\/td>180 magic damage<\/td>Arena increases by 55 \u2014 significant burst increase<\/td><\/tr>
SQUALL AP Ratio<\/td>+10% AP<\/td>+30% AP<\/td>Arena triples the AP scaling from 10% to 30%<\/td><\/tr>
STORMRAIDER Trigger<\/td>25% max HP in 2.5 seconds<\/td>25% max HP in 2.5 seconds<\/td>No change<\/td><\/tr>
STORMRAIDER Cooldown<\/td>30 seconds (starts on Squall application)<\/td>30 seconds<\/td>No change<\/td><\/tr>
SQUALL Delay<\/td>2 seconds after application<\/td>2 seconds<\/td>No change<\/td><\/tr>
On-Death Electric Field<\/td>600-unit radius, same damage as SQUALL<\/td>600-unit radius<\/td>No change in mechanic; Arena damage values apply<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 Arena’s SQUALL Is Dramatically More Powerful Than SR: <\/strong>The Arena version of SQUALL increases the base damage from 125 to 180<\/strong> (+55, a 44% increase) and the AP ratio from 10% to 30% AP<\/strong> (tripling the scaling). At 300 AP on SR: SQUALL = 125 + 30 = 155 magic damage. At 300 AP in Arena: SQUALL = 180 + 90 = 270 magic damage<\/strong> \u2014 74% more damage from the same AP investment<\/strong>. At 500 AP in Arena (high-AP build): 180 + 150 = 330 magic damage per SQUALL<\/strong>, plus the on-death AoE fires 330 magic damage to all enemies in 600 units if the target dies before the lightning. This makes Stormsurge’s passive a meaningful burst contribution in Arena<\/strong> rather than a minor passive rider, and the on-death electric field becomes a genuine teamfight tool in Arena’s condensed 2v2 fights where both opponents are frequently within 600 units.<\/p>\n\n\n\n

\ud83d\udd28 Recipe & Build Path<\/strong><\/h2>\n\n\n\n
Component<\/strong><\/td>Cost<\/strong><\/td>Stats<\/strong><\/td>Notes<\/strong><\/td><\/tr>
Hextech Alternator<\/td>1100 gold (300g combine)<\/td>+40 AP<\/td>Core AP foundation component \u2014 two Amplifying Tomes into Alternator<\/td><\/tr>
\u21b3 Amplifying Tome<\/td>400 gold<\/td>+20 AP<\/td><\/td><\/tr>
\u21b3 Amplifying Tome<\/td>400 gold<\/td>+20 AP<\/td><\/td><\/tr>
Aether Wisp<\/td>900 gold (500g combine)<\/td>+30 AP, +5% MS<\/td>Second component adding AP and movement speed<\/td><\/tr>
\u21b3 Amplifying Tome<\/td>400 gold<\/td>+20 AP<\/td><\/td><\/tr>
Combine Cost<\/td>800 gold<\/td><\/td>High combine cost relative to total item cost<\/td><\/tr>
TOTAL<\/td>2800 gold<\/td>+90 AP, +15 magic pen, +6% MS (SR); +4% MS (Arena)<\/td>2800g is below the standard 3000g+ Legendary tier \u2014 cost-efficient for stat density<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 2800 Gold Cost-Efficiency: <\/strong>Stormsurge at 2800 gold is below the standard 3100-3300g Legendary item cost<\/strong> seen in most fighter and tank Legendaries. For 90 AP + 15 magic pen + 6% MS + STORMRAIDER\/SQUALL passive at 2800g, the AP gold efficiency alone is favorable<\/strong> relative to standard 3100g mage items. The 15 magic penetration is a flat penetration stat comparable to 390g Sorcerer’s Shoes for free in the passive stat line. Cost-efficient burst investment for mages who need AP and magic penetration without spending 3100+ gold<\/strong><\/p>\n\n\n\n

\u26a1 Passive Mechanic \u2014 STORMRAIDER + SQUALL (Two-Stage System)<\/strong><\/h2>\n\n\n\n

Stage 1 \u2014 STORMRAIDER: Trigger Condition<\/strong><\/h3>\n\n\n\n
Parameter<\/strong><\/td>Value \/ Mechanic<\/strong><\/td><\/tr>
Trigger<\/td>Deal damage equal to 25% of an enemy champion’s maximum health within 2.5 seconds<\/td><\/tr>
Target Scope<\/td>Per enemy champion \u2014 each opponent tracks their own 25% threshold independently<\/td><\/tr>
Time Window<\/td>2.5 seconds \u2014 damage must accumulate within this rolling window<\/td><\/tr>
Threshold<\/td>25% of target’s maximum health \u2014 at 3000 max HP target: 750 damage within 2.5 seconds triggers STORMRAIDER<\/td><\/tr>
Result<\/td>Target is inflicted with Squall<\/td><\/tr>
Cooldown<\/td>30 seconds, starting at the moment Squall is applied \u2014 not from the triggering damage<\/td><\/tr>
Cooldown Scope<\/td>Per target? Or per carrier? \u2014 verify current patch; the 30-second CD scope determines whether STORMRAIDER can trigger on multiple targets within 30 seconds<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 25% Max HP in 2.5 Seconds \u2014 What This Means in Practice: <\/strong>The STORMRAIDER threshold requires 25% of the target’s maximum health as damage within a 2.5-second rolling window<\/strong>. Against typical Arena target HP values: a 2000 HP target requires 500 damage in 2.5 seconds; a 3000 HP target requires 750 damage; a 4000 HP tank requires 1000 damage. For burst mages who deal 600-1500+ damage in a single ability rotation, the 25% threshold is trivially met against squishes but may require 2-3 abilities against HP-stacking tanks<\/strong>. The 2.5-second window is generous for burst combos \u2014 a standard Q-W-E rotation completes in under 1 second for most mages, triggering STORMRAIDER on the same combo that also kills the target.<\/strong> Against targets who are NOT killed by the burst: SQUALL fires 2 seconds later as a bonus damage rider.<\/p>\n\n\n\n

Stage 2 \u2014 SQUALL: The Delayed Lightning<\/strong><\/h3>\n\n\n\n
Parameter<\/strong><\/td>SR Value<\/strong><\/td>Arena Value<\/strong><\/td><\/tr>
Trigger<\/td>2 seconds after STORMRAIDER applies Squall to the target<\/td>Same<\/td><\/tr>
Damage \u2014 Alive Target<\/td>125 (+ 10% AP) magic damage<\/td>180 (+ 30% AP) magic damage<\/td><\/tr>
Damage Type<\/td>Area damage \u2014 triggers spell effects<\/td>Same<\/td><\/tr>
Targeting<\/td>Auto-targeted \u2014 fires at the target automatically<\/td>Same<\/td><\/tr>
Range Modifier Calculation<\/td>Calculated at moment of Squall application (not when lightning fires)<\/td>Same<\/td><\/tr>
On-Death Field: Trigger<\/td>If target dies BEFORE the 2-second lightning fires<\/td>Same<\/td><\/tr>
On-Death Field: Radius<\/td>600-unit AoE centered on dying target<\/td>Same<\/td><\/tr>
On-Death Field: Damage<\/td>Same as SQUALL damage (125 + 10% AP on SR; 180 + 30% AP in Arena)<\/td>180 + 30% AP in Arena<\/td><\/tr>
On-Death Field: Target<\/td>All enemy champions within 600 units<\/td>Same<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

SR EFFECT: <\/strong>After 2 seconds of having applied Squall, strike the target with lightning, dealing 125 (+ 10% AP) magic damage<\/strong>. If the target dies before being struck, they emit an electric field instantly that shocks all enemy champions in a 600-unit radius, dealing the same damage.<\/p>\n\n\n\n

ARENA EFFECT: <\/strong>After 2 seconds, strike the target dealing 180 (+ 30% AP) magic damage<\/strong>. On-death electric field: 180 (+ 30% AP) magic damage in 600-unit radius instantly.<\/p>\n\n\n\n

SQUALL Damage Reference Table<\/strong><\/h3>\n\n\n\n
AP<\/strong><\/td>SR SQUALL (125 + 10%)<\/strong><\/td>Arena SQUALL (180 + 30%)<\/strong><\/td>Arena vs SR Increase<\/strong><\/td><\/tr>
0 AP<\/td>125 magic<\/td>180 magic<\/td>+55 (+44%)<\/td><\/tr>
100 AP<\/td>135 magic<\/td>210 magic<\/td>+75 (+56%)<\/td><\/tr>
200 AP<\/td>145 magic<\/td>240 magic<\/td>+95 (+66%)<\/td><\/tr>
300 AP<\/td>155 magic<\/td>270 magic<\/td>+115 (+74%)<\/td><\/tr>
400 AP<\/td>165 magic<\/td>300 magic<\/td>+135 (+82%)<\/td><\/tr>
500 AP (Rabadon’s build)<\/td>175 magic<\/td>330 magic<\/td>+155 (+89%)<\/td><\/tr>
600 AP (maximum build)<\/td>185 magic<\/td>360 magic<\/td>+175 (+95%)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 The On-Death Electric Field \u2014 The Hidden Value: <\/strong>The on-death mechanic is frequently underestimated<\/strong> because it sounds conditional \u2014 it only fires if the target dies before the 2-second SQUALL hits. In practice, burst mages who trigger STORMRAIDER frequently kill their target with the same combo that triggered it<\/strong>. Against a target at 50% HP who takes a full burst rotation: the combo deals the burst damage, STORMRAIDER triggers from the 25%+ damage threshold, the target dies from the burst combo within the same rotation<\/strong>, and the on-death electric field fires instantly from the kill position \u2014 dealing SQUALL damage to all enemies in 600 units of the kill position<\/strong>. In Arena’s 2v2, if the partner is within 600 units of the killed target (very common in Arena’s close-quarters fights), the electric field hits the second opponent simultaneously with the kill. Against clustered opponents, the on-death field effectively delivers SQUALL damage to both targets simultaneously<\/strong><\/p>\n\n\n\n

\ud83d\udca1 Range Modifier Calculated at Application \u2014 Not at Lightning: <\/strong>The documented note states: the range modifier is calculated at the moment of applying Squall, regardless of cast instances and when its damage is dealt<\/strong>. This means the SQUALL range categorization (whether SQUALL is considered long-range, short-range, or standard-range for interactions that scale with range) is locked in at the 2.5-second trigger window<\/strong> \u2014 not recalculated 2 seconds later when the lightning actually fires. If the target moves from short-range to long-range after SQUALL is applied, the range modifier does not update<\/strong> \u2014 the original range at application is used for all calculations.<\/p>\n\n\n\n

\ud83d\udca1 SQUALL is Auto-Targeted Area Damage \u2014 Triggers Spell Effects: <\/strong>SQUALL fires automatically on the afflicted target \u2014 no secondary aim or activation required. The lightning fires 2 seconds after STORMRAIDER applies Squall with zero player input. Additionally, SQUALL deals area damage, triggering spell effects<\/strong> (Liandry’s Torment, Demonic Embrace SINISTER PACT, Horizon Focus FOCUS, etc.) on the target. This spell-effect trigger from an automatic delayed damage source<\/strong> means mages with spell-effect items generate additional passive damage from SQUALL’s auto-trigger without any additional action \u2014 the carrier can be doing other things during the 2-second wait, and the spell-effect triggers fire at the 2-second mark alongside the SQUALL lightning.<\/p>\n\n\n\n

\ud83d\udcca Map-Specific Differences \u2014 Complete Summary<\/strong><\/h2>\n\n\n\n
Parameter<\/strong><\/td>SR<\/strong><\/td>ARAM<\/strong><\/td>Nexus Blitz<\/strong><\/td>Arena<\/strong><\/td><\/tr>
AP<\/td>+90<\/td>Not documented separately \u2014 assume SR base<\/td>Not documented separately<\/td>+90 (same)<\/td><\/tr>
Magic Penetration<\/td>+15<\/td>Same<\/td>Same<\/td>Same<\/td><\/tr>
Movement Speed<\/td>+6%<\/td>Not documented separately<\/td>Not documented<\/td>+4% (reduced)<\/td><\/tr>
SQUALL Base Damage<\/td>125<\/td>Not documented separately<\/td>Not documented<\/td>180 (+55)<\/td><\/tr>
SQUALL AP Ratio<\/td>10%<\/td>Not documented separately<\/td>Not documented<\/td>30% (+20%)<\/td><\/tr>
STORMRAIDER Trigger<\/td>25% max HP \/ 2.5s<\/td>Same<\/td>Same<\/td>Same<\/td><\/tr>
On-Death Field<\/td>Same formula<\/td>Same formula<\/td>Same formula<\/td>180 + 30% AP in Arena<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83c\udfaf Who Benefits Most From Stormsurge<\/strong><\/h2>\n\n\n\n

Champion Archetypes<\/strong><\/h3>\n\n\n\n