Nothing big really just a small exploit.
When you are at the Heart of the Damned and Cydaea comes down to face you, you can go to the top of the area and attract the minions that are near the stairs. When they come close to you, you can use a skill to charge(or whatever skill your character uses to teleport to the nearest enemy. i used my monks main attack Fists of thunder-Thunderclap) through the cage and get on the other side. You can then go down to the exit and bypass Cydaea but the exit is unfortunately not enabled.