In League of Legends, Lethality is a stat that increases the physical damage dealt by a champion’s critical strikes. It is often used by champions that rely on their critical strikes to deal a significant portion of their damage.
When a champion’s critical strike occurs, the damage dealt is multiplied by the critical strike damage (crit damage) coefficient, which is 200% by default. Lethality, on the other hand, increases the base damage of the critical strike, allowing for even higher damage dealt.
Lethality can be increased by items such as Duskblade of Draktharr, Edge of Night, and Youmuu’s Ghostblade. These items generally provide both critical strike chance and lethality, and they are mostly used by assassin champions that want to deal high damage quickly.
Additionally, some champions have abilities that scale with lethality, such as Pyke’s “Phantom Undertow” and Shaco’s “Two-Shiv Poison”
Lethality is a stat that is not present in every game mode, so it’s not available in all maps, and its usage is restricted to certain game modes and champions.