The trick i found was to just burn the big add right at the start, move toons out of the first spike if/when needed, then just do whatever running around to avoid spikes until the core comes out, since the small adds don't hit for much.
If you have a pally tank, just drop consecration every cd and keep divine plea up by hitting a mob every so often.
Aoe the adds down a bit when you feel like it, but keep moving.
When the core comes out, forget everything else and just burn it, can even have ranged just follow the tank up to it if you want. Bloodlust if you need to, recommended on first kill to be sure you get it down before it goes away.