Editing Lifesteal (section)

== Formula ==
Despite being presented in-game as +X% Bullet/Spirit Lifesteal, different sources of lifesteal stack multiplicatively, not additively. With <math>n</math> different sources of the same category of lifesteal, final lifesteal <math>L_F</math> is given by:

<math>L_F = 1 - \prod_{i=1}^n (1 - L_i)</math><br/><!--this is rounded, but the game displays two different calculations where one is rounded up, and the other is rounded down--> 

where <math>L_i</math> is the lifesteal provided by the <math>i</math>th source. Bullet and Spirit Lifesteal are calculated independently of each other, but both use the same formula.

=== Example ===
With 10% Bullet Lifesteal from {{item|Crippling Headshot}} and 35% Bullet Lifesteal from {{item|Leech}}, the player's final bullet lifesteal is:

<math>L_F = 1 - (1 - 0.10) \times (1 - 0.35) = 41.5%</math><!--the stat ingame says 42%, but the calculation on hover says 41%-->

This means that any time the player deals bullet damage to any opponent (including [[denizen|denizens]]), they will immediately be healed by 41.5% of the damage dealt. Note that the in-game user interface is inconsistent in how it rounds the final lifesteal percentage.