Given that the Lunatics in AK have been routinely summoning voidsent and have actively booby trapped the Keep with Vodoriga, it's not unconceivable that they could use simple teleportation spells to move around the ruins of the Keep. I know I wouldn't want to clamor up a set of crumbling stairs every time I needed to go to the top floors. The place is in terrible shape. The only other dungeon I can think of with teleporters like that is Cutter's Cry and that just reminded me of Quicksand Caves where you would fall through the quicksand pits to descend floors. Copperbell doesn't count because you're actually descending down the elevator so the dungeon is continuous.