Stun

A stun is one of the strongest forms of crowd control in League of Legends. A stunned champion cannot move, attack, cast abilities, or use summoner spells for the duration — they are completely frozen, though usually only for one to two seconds.

Because a stun fully removes a target from the fight, landing one at the right moment is often the difference between a kill and a wasted engage. Stuns are commonly used to start a fight, to interrupt an enemy channel, or to peel a diving assassin off a carry. Tracking which enemies still have their stun available is a key part of high-level decision-making.