Well, I already said that I took Luck (although I didn't always get the "lucky wizard" - sometimes I had to manage without it, but it was still quite manageable), Knowledge (definitely Mana Attraction, because it's very depressing without it in this mission - Arcane Wave consumes it twice as fast...), Chaos (well, without it, in my opinion, it's simply impossible to get through...), and Summoning... And I didn't even develop Defense - it remained almost undeveloped until the very end...