I cheated a bit on the demon, since you killed the wizards before they could react... plus I wanted to make him more interesting! He had a loose attitude to the spell-casting rules... but he was a Tzeentch demon, and we all know they cheat!
Besides, Klaus did a truckload of damage to him. Plus I exhausted Klaus's luck for the day... luck is such a useful skill.
Klaus the Demonslayer!
All the baddies are dead, other than some under the crates. The help will arrive in a moment! The doors exploded out with the wrath of Sigmar!
Oh, and the sacrifice girl didn't die. The demonfire didn't hit her (because I forgot she was there... but it didn't hit the guys under the crates either, so maybe it just hits you if you are standing up).
p.s. the demon's name was Gideon. He was Teugen's tutor, and has been following people around while invisible, and turning into children and hunchbacks.