Now me, on the other hand, my eyes were instantly drawn to the "beat with 4 classes to unlock vicious mode" blurb at the bottom of the description. There's only one dungeon that has that characteristic.
Also spoiler tags are probably redundant in this thread, because pretty much everything is a spoiler anyways. The thread is properly tagged, so let's just proceed on the presumption that anyone reading this thread doesn't want to be spoiled.