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What do AD scaling abilities scale on for leech effects?

Take the following skill for example, it is pure AD scaling:

Lee Sin

Spell Summary Sonic Wave: Lee Sin projects a discordant wave of sound to locate his enemies, dealing (50/80/110/140/170) (+(1 per attack damage point)) physical damage to the first enemy it encounters. If Sonic Wave hits, Lee Sin can cast Resonating Strike for the next 3 seconds.

Resonating Strike: Lee Sin dashes to the enemy hit by Sonic Wave, dealing (60/90/120/150/180) (+(1 per attack damage point)) physical damage plus 10% of their missing Health (Max: 400 damage vs. Monsters).

What would I leech health back from?

  • Life steal
  • Spell vamp
  • Both
  • Neither
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1 Answer 1

up vote 8 down vote accepted

Life Steal and Spell Vamp don't proc based on the damage bonus source of the skill (AD versus AP), nor is it based on the damage type (physical versus magical). It's actually based on the kind of skill.

In general, Spell Vamp is the only drain effect that affects skills. All of Lee Sin's skills, despite all being AD-based physical attacks, use Spell Vamp and Spell Vamp alone. Akali is an example of a somewhat physical champion whose attack skills are all Spell Vamp-based (her innate Life Steal is to benefit her auto-attacks only). Even skills like Ashe's Volley, which applies her Frost Shot effect (but only that, the key point being as you'll read up soon), will use Spell Vamp.

Life Steal generally applies only to your auto-attack, but it also applies to skills that apply on-hit effects. For example, Blitzcrank's Power Fist deals 100% extra damage and pops the target in the air in addition to applying on-hit effects (for items like Black Cleaver). This benefits from Life Steal instead of Spell Vamp. Other examples of skills that benefit from Life Steal would be Irelia's Bladesurge, Ezreal's Mystic Shot, and Gangplank's Parrrley.

As far as I know, there is no skill which benefits from both Spell Vamp and Life Steal. It's always one or the other.

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I was about to post a question about this, but I figured I'd try a comment first. Do you know if abilities like Twisted Fate's Stacked Deck receive a bonus from life steal or spell vamp? I ASSUME it's life steal, based on what the ability is, and its use of autoattack. But I am just trying to be 100% certain. Thanks @Grace Note –  Tux Jun 29 '11 at 14:41
    
@Tux in the official article on twisted fate's e there is no hint, wether this is on-hit (and thus lifesteal) or an ability (thus spellvamp). in general i'd assume it is on-hit, if it modifies your auto-attack. triggerable skills are only on-hit if explicitly stated, "passive" skills (like varus' blighted quiver) are on-hit effects. –  Vogel612 Sep 9 '13 at 10:11

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