Checked out this dungeon for the first time, took a few people in.
These guys are surprisingly tough. The casters fire high DC entagles, while you are locked in melee with Weapon Masters with 18 AB. On top of that, they are spamming Ki-Damage, and hitting for 20-40 damage. Owch. They're also packing around 150-200 HP.
Now, this would be fine, except my party (mainly consisting of 8-13s, and me being 16) rested and got a Close to Nothing Has Happened for clearing the entire place. On top of that, the treasure dropped was about 400 gold worth of random junk.
I'm thinking the Xp challenge rating on this dungeon should be bumped up a little bit for the Max Spawn. It's quite challenging and isn't very rewarding for the difficulty, and the treasure is negligible... Compare this to the Vampire dungeon which can be powered through rather easily at max spawn by a part of this level, and still get respectable experience from it (and great treasure.)