This quest is an absolute pain in the butt. Basically, I just ran around in a tight circle to avoid the AoE and to avoid aggroing the extra mobs around. Then, when he started to charge me, I used my Hover ability to quickly move out of the way. I kept my HP up by casting my instant health ability whenever it was up. While he was doing the AoE and I could get close enough and face him, I would use an instant damage cast. It took a REALLY long time to knock down his HP, but if you just realize it will take a while and be patient and diligent about running and doing what damage you can as you run, it is doable, especially when the Blacktalon forces would tank him a little bit for me so I could get in two damage instant casts instead of one. As others have mentioned, do not get too close to the edge or he will restart because on top of being really difficult this is also a rather buggy quest. It is mostly easy to avoid aggroing extra mobs, but be wary of that too--they are pretty far out of the battle area, but it is easy when around crazily around to accidentally step into their aggro. They seemed to lose aggro pretty quickly though if you just keep running from them too, LOL.