Alistar Ability (LoL): Triumphant Roar

Alistar gains Triumph stacks when applying hard crowd control to enemy champions, and when nearby units die. At 7 stacks, Alistar heals himself for 25-161 health (depending on your level) and all nearby allied champions for twice that amount.

Triumphant Roar instantly procs whenever an epic monster or enemy champion dies.

Once Triumph stacks are consumed, Alistar can gain new stacks immediately (Triumphant Roar still can't proc more than once every 3 seconds).