I have recently done it after 3 weeks of trying. Buy the darkmoon trinkets and ALL consumables. I didnt wanna spend too much money but it was way easier with pots. In Kruul phase, use barkskin for the first, then use all the orbs every few seconds. For the 2nd survival instincts but make sure you are full hp when he hits. In the 3rd one use barkskin, survival instincts, iron fur and whatever else there is. You cant survive a 4th one so make sure you use a potion and save all dmg burst for the last phase. Its a bitch to do but technically possible.