Life steal

Life steal is an offensive stat that converts a percentage of the physical damage dealt to health regained. A champion's basic attack, abilities that apply on-hit effects, and abilities that modify your next basic attack all benefit from lifesteal.

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.

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.
 * 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.
 * grants him life steal while he is in this stance.

Masteries

 * grants life steal and spell vamp.

Runes

 * Quintessences of grant  life steal.

Trivia

 * The maximum achievable life steal in Season 3 is 250.8%, using equipped with 5 fully-stacked, a ,  at rank 3, three Greater Quintessences of , a nearby teammate with , and using rank 3.