Diablo III: Reaper of Souls

Diablo is the final boss of Act 4 and she (yes, it's a she) will consist of 3 phases. The first phase you will fight her on her plateau and she will cast bone prisons, fires and she can teleport to punch you. Once you get her health low enough she will stomp the ground and teleport you to the realm of terror where she will spawn a copy of each player fighting her. once you killed the spawn she will reappear and cast several spells at you until she reaches 66% where she will repeat the clone process. She does this again at 33% and after you get her to 1% she will reappear at the plateau and spawn phase 3. In phase 3 you will be back at the beginning and she will have an improved arsenal of spells at her disposal. There are healing wells in the west and east side of the plateau should you need it. Watch out for black shades on the ground which indicates that she will cast bone prison. Once she is defeated the trophy will pop.