League of Legends Atakhan

Atakhan, Bringer of Ruin is a powerful epic monster in Summoner's Rift that can spawn at either end of the river. His form and spawn location are determined by the amount of kills or general combat that has taken place around either lanes by 14 minutes.

Slaying him purges his influence from the map. The slaying team is awarded the Spiritual Purification buff and all Blood Roses on the map automatically. Their Bloody Petals are purified into Spirit Petals, which grant increased effects, and he throws extra Spirit Petals shortly afterward.