{"id":17592,"date":"2026-02-18T14:34:59","date_gmt":"2026-02-18T14:34:59","guid":{"rendered":"https:\/\/magicstark.cz\/wiki\/void-staff\/"},"modified":"2026-02-23T09:00:33","modified_gmt":"2026-02-23T09:00:33","slug":"void-staff","status":"publish","type":"wiki","link":"https:\/\/magicstark.cz\/en\/wiki\/void-staff\/","title":{"rendered":"Void Staff"},"content":{"rendered":"\n

Void Staff<\/strong> is a Legendary Mage item<\/strong> costing 3000 gold<\/strong> providing +95 Ability Power<\/strong> and +40% Magic Penetration<\/strong>. It is the definitive anti-MR item for AP damage dealers<\/strong> \u2014 its 40% magic penetration reduces the effective magic resistance of every target by 40% of their current MR value before any damage is calculated. Critically, magic penetration becomes more effective as target MR increases<\/strong>: at 30 MR the penetration increases magic damage by ~10%, at 100 MR by 25%, and at 200 MR by over 36%. This means Void Staff’s value is not fixed \u2014 it scales upward with every MR item the enemy team buys<\/strong>. Limited to 1 BLIGHT item<\/strong> per player. The single mandatory purchase for any AP carry the moment enemy tanks or carries begin stacking meaningful magic resistance.<\/p>\n\n\n\n

Void Staff<\/strong> is a Legendary-tier<\/strong> item available on Summoner’s Rift (5v5)<\/strong>, ARAM<\/strong>, Nexus Blitz<\/strong>, and Arena<\/strong>. Categorized under Mage<\/strong>, Ability Power<\/strong>, and Magic Penetration<\/strong> menus with ID 3135<\/strong>. Limited to 1 BLIGHT item<\/strong> per player \u2014 this limitation is shared with Cryptbloom and Bloodletter’s Curse. Arena AP is reduced to 65<\/strong> (SR: 95). Sell value: 2100 gold<\/strong>.<\/p>\n\n\n\n

\ud83d\udcca Stats at a Glance<\/strong><\/h2>\n\n\n\n
Stat<\/strong><\/td>Value<\/strong><\/td>Context<\/strong><\/td><\/tr>
Ability Power<\/td>+95 AP<\/td>One of the highest AP values on any Legendary \u2014 second only to Shadowflame\/Rabadon’s scaling<\/td><\/tr>
Magic Penetration<\/td>+40%<\/td>Percentage penetration \u2014 reduces effective MR by 40% of the target’s current MR<\/td><\/tr>
Magic Pen Effective Damage at 30 MR<\/td>+10.17% magic damage increase<\/td>Against light MR investment \u2014 squishies who buy no MR items<\/td><\/tr>
Magic Pen Effective Damage at 100 MR<\/td>+25% magic damage increase<\/td>Standard tank MR value \u2014 Force of Nature, Spirit Visage single item<\/td><\/tr>
Magic Pen Effective Damage at 200 MR<\/td>+36.36% magic damage increase<\/td>Heavy MR stacking \u2014 double MR legendary on tank<\/td><\/tr>
Magic Pen Scaling Direction<\/td>Increases in value as target MR increases<\/td>Every MR item enemy buys makes Void Staff proportionally stronger<\/td><\/tr>
BLIGHT Item Limitation<\/td>1 BLIGHT item per player<\/td>Cannot stack with Cryptbloom or Bloodletter’s Curse<\/td><\/tr>
Total Cost<\/td>3000 gold<\/td>1050g combine \u2014 efficient for the AP + % penetration package<\/td><\/tr>
Sell Value<\/td>2100 gold<\/td>70% sell-back ratio<\/td><\/tr>
Arena AP<\/td>65 (SR: 95)<\/td>Reduced AP in Arena \u2014 still strong due to penetration value<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 The Inverse Scaling Principle \u2014 Why Void Staff Gets Stronger Against Higher MR: <\/strong>Percentage magic penetration is calculated as: Effective MR = Actual MR \u00d7 (1 – 0.40) = Actual MR \u00d7 0.60<\/strong>. The absolute MR reduction increases with the target’s MR total. Against 30 MR: reduction = 30 \u00d7 0.40 = 12 MR removed<\/strong>. Against 100 MR: reduction = 100 \u00d7 0.40 = 40 MR removed<\/strong>. Against 200 MR: reduction = 200 \u00d7 0.40 = 80 MR removed<\/strong>. The magic damage formula is: Damage = Base Damage \u00d7 100 \u00f7 (100 + Effective MR). At 200 MR without Void Staff: factor = 100 \u00f7 300 = 0.333 (33.3% magic damage dealt). With Void Staff at 200 MR: Effective MR = 120, factor = 100 \u00f7 220 = 0.455 (45.5% magic damage dealt). That is 36.4% more effective damage from a single item<\/strong>. No other AP item provides this magnitude of damage amplification against MR-stacking targets.<\/p>\n\n\n\n

\ud83d\udd28 Recipe & Build Path<\/strong><\/h2>\n\n\n\n
Component<\/strong><\/td>Cost<\/strong><\/td>Stats Provided<\/strong><\/td><\/tr>
Blighting Jewel<\/td>1100 gold (700g combine)<\/td>+25% Magic Penetration<\/td><\/tr>
\u21b3 Amplifying Tome<\/td>400 gold<\/td>+20 AP<\/td><\/tr>
Blasting Wand<\/td>850 gold<\/td>+40 AP<\/td><\/tr>
Combine Cost<\/td>1050 gold<\/td>\u2014<\/td><\/tr>
TOTAL<\/td>3000 gold<\/td>+95 AP, +40% Magic Penetration<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 Blighting Jewel as Early Purchase: <\/strong>Blighting Jewel (1100g) is the natural first-back component for Void Staff on AP carries who expect early MR stacking from the opponent. Blighting Jewel provides +25% magic penetration at 1100g<\/strong> \u2014 half the penetration of the full item at roughly one-third the cost. Purchasing Blighting Jewel while completing a different first Legendary item ensures magic penetration is available from the moment enemy tanks start buying MR<\/strong>, rather than waiting for the full 3000g item completion. The Tome component adds some AP alongside the penetration, making the component purchase feel stat-efficient even as an interim hold.<\/p>\n\n\n\n

\u26a1 Passive \u2014 40% Magic Penetration Explained<\/strong><\/h2>\n\n\n\n

How Percentage Magic Penetration Works<\/strong><\/h3>\n\n\n\n

Magic penetration reduces the effective MR<\/strong> of a target before magic damage is calculated. Percentage penetration (Void Staff’s 40%) is applied after<\/strong> flat magic penetration (Sorcerer’s Shoes, Shadowflame’s flat pen) in the damage calculation order. This means the two types of penetration stack multiplicatively, not additively<\/strong>: flat pen reduces raw MR to a lower number, then Void Staff’s 40% cuts that reduced number by a further 40%. Against a 70 MR target with Sorcerer’s Shoes (18 flat pen): effective MR after flat pen = 52, then Void Staff 40% = 52 \u00d7 0.60 = 31.2 effective MR<\/strong>. The combined penetration is dramatically higher than either source alone.<\/p>\n\n\n\n

Effective Damage Increase Table by MR<\/strong><\/h3>\n\n\n\n
Target MR<\/strong><\/td>Effective MR Without Void Staff<\/strong><\/td>Effective MR With Void Staff (40% pen)<\/strong><\/td>Magic Damage Multiplier Without VS<\/strong><\/td>Magic Damage Multiplier With VS<\/strong><\/td>Damage Increase from Void Staff<\/strong><\/td><\/tr>
0 MR<\/td>0<\/td>0 (pen on 0 = 0)<\/td>100%<\/td>100%<\/td>0% (no MR to reduce)<\/td><\/tr>
30 MR<\/td>30<\/td>18<\/td>76.9%<\/td>84.7%<\/td>+10.17%<\/td><\/tr>
50 MR<\/td>50<\/td>30<\/td>66.7%<\/td>76.9%<\/td>+15.4%<\/td><\/tr>
100 MR<\/td>100<\/td>60<\/td>50%<\/td>62.5%<\/td>+25%<\/td><\/tr>
150 MR<\/td>150<\/td>90<\/td>40%<\/td>52.6%<\/td>+31.5%<\/td><\/tr>
200 MR<\/td>200<\/td>120<\/td>33.3%<\/td>45.5%<\/td>+36.36%<\/td><\/tr>
250 MR<\/td>250<\/td>150<\/td>28.6%<\/td>40%<\/td>+39.9%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\ud83d\udca1 The Breakeven Point \u2014 When Does Void Staff Beat More AP?: <\/strong>The core purchase decision for Void Staff is always: does 40% magic pen provide more effective damage than 95 additional AP from another item?<\/strong> The answer depends entirely on how much MR the target has. At 0 MR, Void Staff’s penetration adds zero damage<\/strong> \u2014 buying 95 AP is strictly superior. At 30 MR, Void Staff adds 10.17% damage<\/strong> but 95 AP at 500 total AP adds ~19% more damage \u2014 AP is still better. The breakeven where Void Staff and pure AP provide roughly equal damage contribution is approximately 50\u201360 MR<\/strong> for most mage builds. Above 60 MR on the primary target, Void Staff’s percentage penetration provides more damage amplification than an equivalent AP investment. In practice: buy Void Staff the moment the enemy tank completes their first MR Legendary<\/strong>.<\/p>\n\n\n\n

Interaction with Flat Magic Penetration<\/strong><\/h3>\n\n\n\n
Penetration Type<\/strong><\/td>Source<\/strong><\/td>Calculation Order<\/strong><\/td>How They Stack<\/strong><\/td><\/tr>
Flat Magic Penetration<\/td>Sorcerer’s Shoes (+18), Shadowflame (+20 flat, conditional)<\/td>Applied FIRST \u2014 reduces raw MR to lower value<\/td>Subtracted from MR before % pen applies<\/td><\/tr>
Percentage Magic Penetration<\/td>Void Staff (+40%), Cryptbloom (+25% + healing)<\/td>Applied SECOND \u2014 reduces the already-reduced MR by 40%<\/td>Multiplicative with flat pen \u2014 synergistic, not additive<\/td><\/tr>
Example: 100 MR target, both sources<\/td>Sorcerer’s Shoes + Void Staff<\/td>100 – 18 (flat) = 82 \u2192 82 \u00d7 0.60 (40% pen) = 49.2 effective MR<\/td>Combined effective pen = 50.8 MR removed from 100<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u26a0\ufe0f Percentage vs Flat Pen are NOT Additive: <\/strong>A frequent misconception is treating Sorcerer’s Shoes’ 18 flat pen and Void Staff’s 40% pen as 58% combined effectiveness. They are multiplicative<\/strong> \u2014 flat pen reduces the raw MR number first, then % pen reduces the remaining amount. Against 100 MR: flat 18 pen \u2192 82 effective MR \u2192 Void Staff 40% \u2192 49.2 effective MR. The ‘total penetration’ is not 58% of 100 \u2014 it is 50.8 MR removed from 100. Understanding this means flat pen slightly reduces Void Staff’s absolute MR reduction<\/strong> (because there’s less MR remaining for % pen to act on) while both still multiply together for maximum combined effectiveness.<\/p>\n\n\n\n

\ud83c\udfaf Who Should Buy This Item<\/strong><\/h2>\n\n\n\n

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