The problem wasn't beating the game, it's that they will walk between this one treasure room you couldn't build around and the entrance instead of going to the exit. (Dang t shaped sides >.<)
Darkir they jump to the 5th floor when they are level 5. The classes are cleric, theif, warrior, barbarian, wizard, and paladin(or knight forgot which). It's completely random which you get, they come every couple of levels up to 7 units. The levels they join are the same every playthrough. The ai is a bit bad, but smart pathways and minimizing the amount of them helps get through better.
Also woot got platnium ^.^ gogo Dmg reduction paladin soloing.