Bladesoul

Bladesoul is a Miniboss that spawns in the area in a small, circular arena to the right of the Crimson Isle entrance. Bladesoul also spawns mini minions which have 5m health.

Spawning
Bladesoul spawns around 5 minutes after being defeated at -295 84 -518

Drops
Bladesoul drops Hallowed Skull which is needed to complete one of the Dean quests.