I've done it a few times and the boss has spawned every time.
Posts made by Arcanigans
RE: Calantar's Cave
Had a lot of fun with the quest as a whole, though. Just the right amount of challenge, spaced out well for breathers. Could use some more potions dropping on orc corpses for the sake of replenishment and scrounging mid-combat, but other than what's been discussed I thought I'd just pipe in to say it was fun!