法术吸血

Spell vamp is a magic stat that works as a counterpart of life steal. However, instead of regenerating health based on basic attacks, the regeneration of health is based on damage done by champion abilities. It works off of activated item effects, summoner spells, and abilities, regardless of the type of damage done. Spell vamp is calculated from the damage dealt to the enemy after reductions such as magic resistance, armor or effects like Unbreakable Will. See also : list of effects that apply or don't apply spell vamp.

Increasing spell vamp

Items

• Hextech Revolver: Unique passive: +12% spell vamp, +40 ability power. 1200 gold
• Hextech Gunblade: Unique passive:+20% spell vamp, +40 attack damage, +15% life steal, +70 ability power. Unique active: Deals 300 magic damage and slows the target champion by 50% for 3 seconds. 60 second cooldown. 3625 gold.
• Lord Van Damm's Pillager: Unique passive: +10% spell vamp. +350 health, +40 attack damage. Unique passive:+10% cooldown reduction. Unique passive: +25 armor penetration. 2962 gold.
• Spirit Visage: Unique passive: Increases healing and regeneration on yourself by 15% (includes spell vamp). +30 magic resistance, +250 health. Unique passive: Reduces ability cooldowns by 10%. 1550 gold.
• Will of the Ancients: Unique aura: Grants nearby allied champions +30 ability power and +20% spell vamp.+50 ability power. 2500 gold.

Champion abilities

• Ahri's Essence Theft grants 35% spell vamp for the next spell upon reaching 9 charges of Essence Theft.
• Akali's Twin Disciplines grants 8% spell vamp when she obtains 10 bonus attack damage, increasing by an additional 1% for every 6 bonus attack damage gained thereafter.
• Lee Sin's Iron Will grants 5% / 9% / 13% / 17% / 21% spell vamp.
• Morgana's Soul Siphon grants spell vamp.
• Olaf's Vicious Strikes increases his damage based on his health and grants him 9% / 12% / 15% / 18% / 21% life steal and spell vamp for 6 seconds.
• Ryze's Desperate Power grants 15% / 20% / 25% spell vamp.

Masteries

• Transmutation Transmutation grants 1% / 2% / 3% spell vamp.

Runes

• Quintessences of Transmutation grant 1.12% / 1.56% / 2% spell vamp.

Notes

• All items that provide spell vamp have that stat as unique passive. Accordingly, same item stacking won't make spell vamp stack.
• Spell vamp applies to all types of damage: magic, physical and true.
  • There's a common misconception it only applies to magic damage, which is not true.
• Spell vamp applies to everything that isn't classified as an auto-attack. This is most abilities, but also includes items (e.g. Hextech Gunblade) and summoner spells (e.g. Smite).
  • On-hit damage modifiers (e.g. Siphoning Strike, aka "bonus" or "additional" damage), on-hit damage over time (e.g. Seastone Trident and Toxic Shot) and abilities that apply on-hit effects (e.g. Parrrley and Mystic Shot) are classified as auto-attacks, and will not apply spell vamp.
    • They will instead apply life steal, permitting they deal physical damage.
    • Life steal only applies to the physical portion of basic attacks. For example, Siphoning Strike will apply life steal but Toxic Shot and Malady will not.
    • Nothing replenishes health for magic and true damage dealt by auto-attacks.
  • A list of champion abilities on-hit effects that trigger spell vamp can be found here.
• Area of effect (AoE) spells only apply 33% of the listed spell vamp.
  • Some abilities as Fox-Fire are classified as multiple single-target projectiles, and will apply 100% of your spell vamp. Whether an ability is classified as such is case-by-case. For example, Hextech Micro-Rockets is classified as AoE despite being similar to Fox-Fire.
  • Abilities with both single-target and multi-target effects, such as Mace of Spades and Lay Waste, will apply spell vamp depending on which effect occurs. In that, full spell vamp against a single target; or 33% against multiple targets.
  • Single target abilities that apply splash damage will apply full spell vamp to the original target, and 33% to the splash damage. For example, Conflagration with Blaze and Desperate Power.
• Damage over time abilities (DoT) apply full spell vamp. (e.g. Brand's Blaze and Malzahar's Malefic Visions).
• Does not work with the reflected damage of Thornmail. It does, however, work with the reflected damage of Molten Shield and Defensive Ball Curl.
• Healing reduction effects like Ignite, Executioner's Calling, and Tristana's Explosive Shot reduce the health restored by spell vamp. See healing reduction for more information.

Calculations

The amount of health restored with Spell Vamp follows the following formula:

Health restored = total spell damage × spell vamp × vamp coefficient

where

• Total spell damage is the the mitigated spell damage done to every target affected, and
• Vamp coefficient is 1 for single target spells and 1/3 for multi-target spells.

Examples

Assuming targets with 0 pertinent resistance (armor for physical damage or magic resistance for magic damage):

• 25% spell vamp on a single-target spell that does 100 damage will return 100 × 0.25 × 1 = 25 health.
• 25% spell vamp on an AoE spell that does 100 AoE damage to each of 4 targets will return 4 × 100 × 0.25 × (1 / 3) = 33.3 health.

Trivia

The greatest spellvamp currently possible is 200% on Akali.

This requires:

• Attack Damage sources
  • 200 AD - 2 x Bloodthirsters (fully stacked)
  • 110 AD - Sword of the Occult (fully stacked)
  • 40 AD - Hextech Gunblade
  • 40 AD - Exalted with Baron Nashor
  • 10 AD - Elixir of Fortitude
  • 8 AD - nearby Aegis of the Legion (aura)
  • 23 AD - Raise Morale
  • 50 AD - Eye Of The Storm Eye Of The Storm
  • 20 AD - Hymn of Valor
  • 35 AD - Radiance
  • 5 AD - Ignite with Summoner's Wrath Summoner's Wrath
  • 39.25 AD - Marks of Might, Seals of Might and Glyphs of Might
  • 3 AD - Brute Force Brute Force
  • 9 AD - Deadliness

Total AD: 592 AD (note that the first 10AD equates to 8%)

Conversion: (592 - 10) / 6 = 97.04%

Total: 105.04%

• Spell Vamp sources
  • 20% - Hextech Gunblade
  • 20% - Will of the Ancients
  • 20% - nearby allied Will of the Ancients (aura)
  • 6% - Quintessences of Transmutation
  • 3% - Transmutation Transmutation

Total: 69%

• Spirit Visage Improves the subtotal of 174.04% to 174.04 * 1.15 = 200.15%

See also

• Magic damage
• Life steal
• True damage