The layout is very similar to the Nektropos Castle. However, you are forced to take a specific pathway due to blocked passages.
You need to pass through locked door or passage ways all through the zone.
Mobs randomly drop copper key and iron key that can open small chests within the zone. We never found anything in these chests.
I found some boots in one, seems to notify you by the HUD, only the person opening the chest gets the reward.
There is not a single location that gives AA discovery.
Walkthrough
The zone has nothing to do with Maltena, nor does it give a quest update. "Putting Maltena to Rest" is only the starting access quest to be able to run through this zone. Purely for fun and loot. All named monsters give aa exp, and decent loot.
Random Drops from the monsters give 3 different keys which range from copper, iron, and brass.
Only the copper keys give loot from random chests all throughout the zone. Iron will give nothing. Not sure about brass.
The first room is full of Eidolon watch dogs. In the stables can be the first named : Demitry the Ravager, around the forge can be Unargin the Blacksmith. You need to kill 2 a flesh rampager 53 (severe undercons with mana drain and some sort of damage reduction) in order to unlock the door.
After a few turns in a corridor you arrive in a room with several ghosts in it, amongst them can be Butler Balthazen. Kill them and touch the door. The Burning Soul will spawn in the firepit. He sends you some soul ember that you need to kill. After 4 waves of minions, he will attack you. Killing him will unlock the other door of the room.
You need to go on the corridors upto the end. You will meet The Spirit Sucker in a side way. Maid Maltena might be up in a side room as well. In the Prison Torturess Amanda can be up. Watchman Gantder can also be in the prison. In the Chapel you can find Archbishop Z'Latten or Bichop Cephus (that second named doesn't give any AA or loot). At the end of the corridors kill Chalandria the Queen of the Cursed. When she dies it unlocks a secret passageway through a wall not far. It will be highlightable along the wall. Take it.
Reach Sheila's room. A ghost sent by her father will arrive and kill her. She will respawn as The Cursed Remains of Shiela Everling (Yes there is a typo in this name in game) along with puppets. Kill them. That will unlock the door of her room.
Reach Jenni's room : In a side room there is Groundskeeper Edgan for you to kill. In Jenni's room the ghost that killed Shiela arrives and kill Jenni. Once again The Cursed Remains of Jenni Everling will spawn with some dolls. Kill them.
Reach Crysta's room. Go back in the corridor, and take north, you'll reach a room with Captain Greeves and a teleporter. Kill the named and take it. You'll be in another corridor. In a side room you'll find Lady T'Kalin. Proceed to Crysta's room. In Crysta's room the same event occurs. Kill The Cursed Remains of Crysta Everling and her dolls.
Reach Deirdre's room and kill The Cursed Remains of Deirdra Everling (Yes there is a typo in this name in game) and its dolls. Be careful they stifle your group.
Take the teleporter in Deirdre's room. You arrive next to another tower. the door is locked. Follow the corridors to another locked door then to an unlocked door. The Thexian Overlord can be there for you to kill. Go on untill Alana's room.
In the now unlocked room you'll finally find Lord Everling. With many 56v spirit wisps with him when he becomes aggro. It's the last event of the zone. He will knockback so be prepared.