Sacred Haven of Debauchery

which dragon?) I killed them all myself...

I killed the ice dragon with a demon. No one helps there, they just get in the way later, like Sylvio and Bulko (you have to defeat them).

It seems like magic has very little effect on him, although I don't remember exactly

But not with magic, do it manually ;)

Oster, he's a dragon snapper, that cute thing

Ah, I see, I didn't know about that feature :)