Okay, it has been a long while since I went through this area. I'm now taking my son through it. He finished the main part of the quest through here but he wants to do the side quests.
He defeated Oskar Crowfield although I can't remember how he comes about. Anyway, he can't seem to get the quests for Katalin Nightseeker. Specifically, the quests to take on the two other bosses on this level.
At what point do the side quests for Katalin Nightseeker become available?