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| '''Lifesteal''' is a mechanic which heals a player by a portion of the damage they deal to an opponent. There are two main types of lifesteal, each with an associated [[stats|stat]]: {{plink|Bullet Lifesteal|pic=AttributeIconBulletLifesteal}}, which returns a portion of the [[Bullet Damage|bullet damage]] dealt, and {{plink|Spirit Lifesteal|pic=AttributeIconSpiritLifesteal}}, which returns a portion of the [[Spirit Damage|spirit damage]] dealt. Bullet and Spirit Lifesteal are calculated independently, but use the same formula.
| | Lifesteal is a stat that causes a percentage of damage dealt to be regained as health. |
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| == Calculation ==
| | It can be gained as either Bullet Lifesteal or Spirit Lifesteal |
| While lifesteal is shown as a percentage (like +20%), different sources of lifesteal do not simply add together. Instead, they stack '''multiplicatively'''. This means that as you gain more sources of lifesteal, each new item is slightly less effective than the last.
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| To calculate your final lifesteal, you can use the following formula:
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| <math>\text{Total Lifesteal} = 1 - (1 - L_1) \times (1 - L_2) \times (1 - L_3) \dots</math>
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| (Where <math>L</math> is the lifesteal value of each source expressed as a decimal, e.g., 0.20 for 20%).
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| === Example ===
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| If you have 22% Bullet Lifesteal from {{item|Fury Trance}} and 30% Bullet Lifesteal from {{item|Leech}}, your lifesteal is calculated as follows:
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| # Convert the percentages to decimals: '''0.22''' and '''0.30'''.
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| # Subtract each from 1: (1 - 0.22) = '''0.78''' and (1 - 0.30) = '''0.70'''.
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| # Multiply those results together: 0.78 × 0.70 = '''0.546'''.
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| # Subtract that result from 1: 1 - 0.546 = '''0.454'''.
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| # Your final Bullet Lifesteal is '''45.4%'''.
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| Note: The in-game user interface is inconsistent with rounding, so it may display as 45% or 46%.
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| === Lifesteal vs. Creeps ===
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| Lifesteal against creeps (non-hero units) is reduced compared to heroes:
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| * '''Bullet Lifesteal vs. creeps:''' 60% effectiveness (e.g., 10% lifesteal becomes 6%).
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| * '''Spirit Lifesteal vs. creeps:''' 40% effectiveness (e.g., 10% lifesteal becomes 4%).
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| == Bullet Lifesteal ==
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| Bullet Lifesteal returns a percentage of all outgoing [[Bullet Damage|bullet damage]] to the player as health.
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| {{HeroIcon|Graves}} has {{#invoke:HeroData|get_hero_var|hero_necro|BulletLifesteal|3}}% innate Bullet Lifesteal.
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| === Sources ===
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| {{Item stat table|Bullet Lifesteal}}
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| === Hero Abilities ===
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| The following abilities provide Lifesteal:
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| {{AbilityTable|lifesteal}}
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| Abilities that deal weapon damage also provide heal from Bullet Lifesteal. Here are all of the relevant abilities:
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| {{AbilityTable|weapondamage}}
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| == Spirit Lifesteal ==
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| Spirit Lifesteal returns a percentage of all outgoing [[Spirit Damage|spirit damage]] to the player as health.
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| === Sources ===
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| {{Item stat table|Spirit Lifesteal}}
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| == Melee Lifesteal ==
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| {{main|Melee Lifesteal|Lifestrike}}
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| Melee Lifesteal is provided by abilities such as {{AbilityIcon|Abrams}}' {{AbilityIcon|Infernal Resilience}} and {{AbilityIcon|Apollo}}'s {{AbilityIcon|Riposte}}, and heals for a percentage of melee damage dealt. It functions the same as other Lifesteal effects and has 40% effectiveness against creeps.
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| The item {{item|Melee Lifesteal}} and its upgrade {{item|Lifestrike}} both provide a passive ability which heals the user by a percentage of their [[Melee Damage|melee damage]] dealt, but they behave differently from Lifesteal.
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| These abilities activate for one melee attack, then go on cooldown for several seconds, during which no further health can be regained from melee attacks. In contrast, Bullet and Spirit Lifesteal are always active and have no cooldowns. These items also grant a flat healing bonus on activation, and are less effective against non-[[hero|heroes]].
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| {{Stats}}
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| [[Category:Stats]]
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