Source:dota2.gamepedia.com/Lifesteal
Lifesteal and other Abilities
- Critical Strike: Lifesteal is calculated after Critical Strikes, which means that it will increase the amount of life you steal.
- Bash: Only bashes that deal physical damage will grant lifesteal.
- Lifesteal will only work on the main target of the attack, abilities that cause an attack to hit more than one target (e.g. Cleave, Splash or Moon Glaive) do not add extra lifesteal, despite what the animation might show.
- Illusions do not benefit from lifesteal or lifesteal auras, although they perform the animation.
- Lifesteal will not work on abilities even if they do physical damage.
Triggered Lifesteal
Certain lifesteal effects were written as triggered effects in the
original Warcraft III engine. While such nuances are moot as of Dota 2,
the following spells still behave differently than other lifesteal
effects:
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- Feast is written as two independent effects. The damage is
reduced by armor, but the heal to Lifestealer is not. Therefore, the
heal cannot be increased with damage bonuses such as critical strike.
Lifestealer's physical attack damage (including the bonus damage from
Feast) can still benefit from other sources of lifesteal.
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- Open Wounds is unique in that it will grant allies lifesteal on
the target. All damage dealt can grant lifesteal, including magical
damage from spells. This is the only way ability damage can grant
lifesteal. (regardless of skill's damage type)
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