Neverwinter

Castle Never is back! Though...it's not quite the same as it was before. It may be a bit shorter, and is slightly less difficult; but it brings on new challenges not seen before. There's a lot of zoning too, so be prepared for that as you seem to be warping in and out all over the place. The description is in-depth enough, yet purposefully vague.

Phase 1: You begin on the bridge, vanquish a few mobs and view a short cutscene and you'll be able to enter the Castle itself. Upon entrance you'll be in a hallway with two open green rifts (one at each end) these will spawn enemies that you must dispatch. After a few waves you'll enter a large room with blue rifts dotted around it. You must close each rift to progress, then you'll have to defeat the mobs exiting a purple rift. Shortly after you'll meet your first boss, Tal'Gath the Undying.

Phase 2: After the boss has fallen you'll enter a long hallway filled with undead and a major demon enemy. Once you defeat these enemies you'll be required to destroy four Orcus servitors that are within the twisting halls and dark rooms of the Castle. Once complete, you'll head to the end and enter a purple rift. Here you'll zone into a small arena with a green sphere in the middle of the room. Mobs will slowly move towards the sphere, kill the mobs before they can enter it. Shortly after that, you'll ascend the spiral staircase to face the second boss, Cthylar the Illithilich. Please reference "Dancing on the Ceiling" for more information.

Phase 3: Now you'll have to traverse the darkness, killing mobs as you go. At a certain point a small cutscene of a green sphere chasing a person will play. These are the Death Spheres, you must avoid these 5 times for the "Death Spheres" achievement. Once you reach the end you'll be at the door for Orcus, the final boss. Please reference "Demon Prince of Being Dead" for more information.