Life steal

Life steal is an offensive stat that converts a percentage of the physical damage dealt by a champion's auto attack (and the small number of abilites that proc on-hit effects as noted below) to health regained.

Life steal is calculated from the actual damage done to an enemy, after armor and all other forms of damage reduction. Almost all champions have 0% base life steal. It can be increased with items, runes, masteries, and some champion abilities.

Core

 * increases regeneration from life steal.
 * increases regeneration from life steal.
 * increases regeneration from life steal.
 * increases regeneration from life steal.

Champion abilities
Note: Only the life steal buff effect of these abilities is shown here, to read more information on each of these abilities, follow the link on each of them.
 * grants life steal for 5 seconds.
 * passively grants him life steal.
 * increases his damage based on his health and gives him life steal for 6 seconds.
 * grants him life steal for 20 seconds.
 * grants him 30% life steal for the duration of the ability.

Masteries

 * grants life steal.

Runes

 * Quintessences of grant  life steal.

Trivia

 * The maximum achievable life steal is 290.15%, using equipped with five fully-stacked  and a,  at rank 3, three Greater Quintessences of , four nearby teammates with , and using rank 3.