I figured this guy out yesterday. The advice on here all helped, but the biggest thing is to just get out there and do him. The first few times i killed him, i wiped at least 3 times per kill.

Here's what i learned...

like what everyone said, slow-and-steady is the winner. Although don't waste any time once the debuff falls off, to start dps and spawn the next pure energy. The boss himself hits relatively hard, and if you let it draw on too long, your healer will run oom. I let my paladin kill the first couple sparks, then wait 30 seconds for debuff to fall off. Then kill the next 2, then let debuff fall off. When my priest was getting low on mana (typically 30-40%) i popped all 3 elementals, bloodlust, and took down the rest of the boss's hp in like 10-20 seconds.