Amarog is a giant purple armored werewolf that is the World BOSS of Mount Nubina. Amarog is used for rebrith quest pack's, there isnt any other quest or achievement around it. Unless there is an event telling you to kill him.

Amarog attacks like a "rogue". He also sleaths.

  Drops (level requirement): 

Spawn Link

[a^Mount Nubina(X:75 Y:24)^2409,787@e5]

Amarog loc

Where Amarog spawns