Well, I completed it. On the fourth floor there were Pannons and Vances (the mutated flowers... think they are called Vances lol) Those seemed to stop spawning (never went back up there to re-check.
On the third floor however, the Gaozoran (floating mage mobs) never stopped respawning, so I let those be after a while.
On the 2nd floor, there were more Pannons, then followed by a mix of Pannon and Carriguines, and then finally Carriguine x2 which then let the flames on the second floor go away. After that, there are some cutscenes, then you pwn Curtz face and you done