These arenas are the places where one of the World Bosses can appear. World Bosses spawn only after completing the main story campaign, and they only appear at certain times. Once you kill them all, you will complete the "World Boss Slayer" Challenge.
One of the three following World Bosses can spawn here:
- Ashava, The Pestilent
- Avarice, The Gold Cursed
- Wandering Death, Death Given Life
