The layout is typical for a fort, but there are also altars and banners added by the necromancers. Some parts seem to have been flooded in the past. There are a few chests with minor loot scattered around.
Hannibal Traven says that two of the high-ranking members of the Council have left, taking two powerful artifacts with them. He is afraid that Mannimarco will find the mages, kill them, and take the artifacts, thereby gaining more power.