Deny Salvation

Deny Salvation is a Quest you get given once you defeat the Cockatrice in Gran Soren, To get it you need to accept to go on the expedition and when talking to the Duke in the Treasury a guard will enter and say that the leader of Salvation has attacked Greatwall. The Duke will then say that the expedition will wait and to go after the leader. After the Duke has given you this Quest, the quest for Lady Aelinore, Duchess in Distress will become avaliable.

Walkthrough
After you have arrived at the Greatwall Encampment, there is a place to rest and buy supplies outside.

After you pass through the portcullis, venturing about halfway across the large yard, towards the Salvation Members will cause them to flee. As they flee, two armored Cyclopes enter the courtyard, along with numerous Glacial Harpies. After defeating the enemies, giving chase to the Slavation members will take you into the main keep of the Greatwall. Passing through a narrow passageway in which Skeleton Knights will spawn will bring you into a room with more skeleton knights. In the room there is an impassable door (barred from the other side) and a section of broken wall which, upon examination, states that sufficient force will break it (throw an explosive barrel at it). If you do blast open the wall, continuing down the stairs will bring you into a room with half a dozen skeleton warriors, and three guards. After dispatching the skeletons, a guard will open a gate to a chest. From this room, continuing up the stairs, past Slavation mages will brong you into a large room, containing a Chimera and two ballistae. After the Chimera is slain, a guard will unlock the door at the end of the room, allowing you to progress into a room with several chests, and then on to the roof. When on the roof, you will fight more Skeletons and some Skeleton Mages/Sorcerers. Another guard here opens another locked gate, allowing you access to a room with a chest. However if he perishes you can blast your way in to the chest room through another weakened wall segment. Continuing up towards the quest objective will bring you to a room where you will have to fight a Skeleton Lord, after which yet another guard will open yet another chest-bearing room. Opening the gate and heading onto the roof will enagage a cutscene involving Elysion and then a fight with two Wights and many undead. After dispatching the Wights, another Elysion cutscene ensues, which takes an extremely dramatic turn. Make sure you have picked up all of the loot on the rooftop before finishing off the last wight.