Should be easy to solo, just like everything else, right?
I get through the first phase ez mode, now its time for Essence of Desire.
She casts spirit shock every .75seconds it seems, and guess what? It confuses its target for 5 seconds! Also, applies a debuff which happens to increase healing taken by 100%.
So, you can't solo this boss because you are stuck in confusion.
And if you're a warrior you will be stuck in combat unable to die due to second wind being awesome, until you alt+f4 to reset the boss.