did you get a Stygian abyss drop from him which all that time spent?
If you're referring to the mini-boss in the area, I only killed him once and I got a piece of virtuous epiphany armor from it. I got all of the blue bone pieces from undead guardians.
I really started farming in that area for imbuing materials. I figured I'd go ahead and start collecting the armor after that, figuring it would be fun. I created a spreadsheet to keep track of what I had and needed. I decided to collect three sets. I'm five pieces from completing set number two and I believe thirteen pieces from completing set number 3. Sets two and three will be going to a couple of my guild members because I think they should have them.
I have thought about collecting more sets and selling them (I want to get a castle soon, dangit), but I don't know if there would be any demand for that sort of thing.