The exit portal that takes you to the Gatekeepers is very heavily guarded by Entropy Wisps, Doomed Spirits, Mu-miyahs Sentinels, and a couple of Bone Scourge. The mu-miyahs in particular hit very hard. The ghosts cast level 6 War spells and also Wall spells. Because Entropy Wisps are black, they can be difficult to see and block your way at two locations (below). These need to be killed before proceeding, preferably with War or Missile weapons. 2. The final room in the Southwest corner. If you are lower level or do not have a good escort team, get through the as fast and carefully as possible.