These guys are much easier with a group--have a priest healing and backup should make this a really cool dungeon!
BTW, each 'set' piece will drop from the same Dragon--a different piece each time--well, randomly..so you may get dupes along the way.
These 4 huge Dungeons are DPG type areas--good hard as hell fun!
And yeah, the treasure will kick major ass--once you start getting it all, they will be easier to kill.
And get you ready for Undermountain level 16 and 17!