The eastern part of the zone? I found him towards the north of the area where the ghost wolves are but yes, this is the eastern part of Blightfire Moors. There was another named in the same region, also with a name starting with D - sorry, I did not make a note of it.
As far as "phasing" goes, I have found that if he phases after you start casting, the spell will still hit. If you start casting while he's translucent, the spell may or may not hit. I use Immolate to lower his AC.
i have a lvl 29 chanter I killed him with 3 charmed dogs...
i would charm one... send him to the named
run away root and tash another and wait for the 1st to die.. charm the 2nd and run behind him root the named and let the 2nd one get on him.. run to the next dog... rinse repeat..
have to have sow on or your a dead toon...
also not this mob willl " phase " in and out.. when he is phased out.. you cant hit or cast on him... but have killed him 5 or 6 times and he drops nothing but the tooth
the tooth is for a quest you get from trapper Ozanna after doing the intrepid hunter quest gotten from the signpost near crescent reach Your reward is a minor cape, probably not worth it except for the XP.
Drops Denlord Darkmoon's Tooth. I guess its for a quest that I have yet to find. If he drops something else besides that I have not seen it. Kinda lame for a lvl 30 named that can quad in the 80s.