Greyman, Sylvanas, Pandaren, 486ilvl, 1/1/3/2/2/1 BM ( Spec made specially for this fight )
Morchok HC - Dragon Soul - Solo
Mark Petrie - Aurora
Hanz Zimmer - Time
Two Steps from Hell - Protectors Of The Earth
Tried this boss one month ago but after hitting the enrage timer ~15% I decided to postpone it until I got a better weapon. Fortunately the gun from Terrace dropped last week and I came back.
Glyph of Animal Bonding - All healing done to you+pet increased by 10%
Glyph of Mending - Increase the healing done by Mend Pet by 60%
Glyph of Misdirection - when pet gains MD, cd is reset.
The pet doesn't receive damage from Stomp. Other than healing him and a heavy dps fight, 20% soft enrage is the only problem since the bosses together do twice as much damage. Gaining aggro of one of the bosses was intended since the pet can almost get one-shotted at that point and one boss has to be kited until cd's are ready again or next black phase starts. Surviving is key in this situation.
You can also predict where the crystals will spawn so you can move there in time to take less damage. Have fun !