Hey, I tried it 2 more times with my LS and we did 1 farming run, and 1 boss run. Anyway, what we discovered, is that the assistants that he has floating around, will do some decent AoE damage repeatedly. But they don't move except when they all warp at the same time. And when they warp they can teleport to the inner circle or the outer ring, and will do their AoE damage there. So if they teleport on the outside ring, you must stay in the middle circle. And the same, if they're on the inner circle, you kite/fight boss on the outside ring.
Also, we think if you just kite the boss and have archers and mages doing healing/dot/nuking, and each person kiting when they have hate. The reason we think kiting will work, well, is because he does his drop-down slam move that he seems to be able to spam and does heavy damage to people. So with all ranged and mages, you should be able to avoid damage entirely if done right, except at engagement of course. So try kiting inside circle and outside ring.
Let me know if anyone tries this and has it work/fail please. *^.^*