Song: The"U.N.Owen" is her？ - CYTOKINE

Not an overly bad boss fight, the first couple of seconds of the first phase and the last 6~ seconds of the fight are probably the best.

First things first, recommend but may not be required to use Burst of Speed. I also suggest using the Evasion glyph.

Starting the fight:

Pop the Dark Anima globe and the fun begins.
Start off by killing as many of the small Anima Golem around you, then position yourself in any way that once the rest of the Anima Golem have approached you that you can Evasion without any of them managing to get behind you (One hit from them at this point will probably kill you). Turn on Blade Flurry and kill them quickly with Killing Spree.

Once you have all of the small golem dead work on killing the Large Anima Golem (You'll more than likely need to kill some of the Critically Damaged Anima Golem to activate some of the Large Golem). We want the Large dealt with because that will remove a huge portion of the movement required once the Dark Animus has activated.

After all of the Large Anima have been taken care of kill one of the Massive Anima Golem and that should cause the Dark Animus to engage (You can use this time to stall and let any CDs that are down come back before activating Dark Animus).

Once engaged one of his first abilities he will use is Anima Ring (Summons several spheres in a ring around the target. The spheres move towards the center of the circle and if touched will increase damage taken from melee attacks by 200%). It's important that we make sure Killing Spree is available for the first Anima Ring so that we can safely avoid getting any Stacks this early on since we will likely get one more cast of Anima Ring before he dies (If you get hit by an orb using Evasion w/ Glyph lasts long enough for the debuff to wear). Do not waste/use Cloak of Shadows as it is considered a Physical Debuff.

Once the Dark Anima has 100 Anima stored he will start casting FULL POWER! if you do not have Cloak of Shadows ready this ability will kill you very fast (This pretty much means that we need to use Cloak of Shadows and kill it during).

Armory: http://us.battle.net/wow/en/character/garrosh/Koshi/advanced