I followed many of the intructions on various websites, and put together a simple way of doing this guy on HEROIC.

I run a group of 1 pally, 3 dps range, and a priest.

P1
I had my priest spam group heal and circle of healing in phase1, the ae he does will always hit you, so positioning isnt curcial at start, and you will need to heal through it. I placed my guys 10 yards from my tank, and when the orb pops, kite the boss around to keep it from attaching and healing the boss. Dps the orb down, and get back on the boss.

P2. Make sure no orb is up, or you'll go into p2 with him 240k more hp, and most likely wipe.

Stack up in middle as he casts his spell into phase 2, and drop a fear ward on the tank. safe zone is dead center of the room. He will fear random members(individual fear), to the outside of the room, where an ae is constantly bursting dps out. move back in center, and dps him down.

It's quite simple if you have enough dps and a good ae healer.

Hope that helps.