ToME: the Tales of Maj'Eyal

I ran into the boss in the Infinite Dungeon and he was unkillable (500% resist all). I understand that he is supposed to summon tentacles at some point, but he just followed me slowly while I cleared the level, and I never say any tentacles.

Sometimes it really takes its time to summon tentacles, and even then you have to kill something around 10 of them. I met it once in a vault in Tol Falas, and I had to kite it around the dungeon a couple of times before it summoned enough tentacles for it to eventually die.

This was in beta 15b, so I can't speak for any of the svns.