Kingdom of the Cleansed
In this quest you’ll meet Tristian. Eventually, he’ll come to your throne room and tell you about some cult member who has come to town. Go to the town square, find Tristian’s icon on the map and head for it. Talk with the girl standing next to him and then with Tristian. After that, open the world map. Move to the right and down, away from the capital and towards a new location – Secret Sanctum (it’s below the bridge).
After arriving at the place of ritual and investigating it, start a fight with the worshipers and a man in a hood. First you should kill him and his assistant, and all the others will run away. A mysterious man will threaten you with a Goddess and disappear. Now you only have to go back to the town square, find Tristian and talk with him. This will end the quest, and you’ll get 900 XP.
If you have already saved Tristian in one of the story quests, he’ll seek king’s audience. After having a conversation in a throne room, you’ll need to meet Tristian outside, in the main square. Head for the Kingdom of the Cleansed – it’s not far from the Temple of the Elk.
Kill the cultists and investigate the bodies to get to know where is the First Faithful building the settlement. Go to the City of the Hollow Eyes (in the upper right corner of the map) where you’ve already been when looking for Faceless Sister. Move to the upper corner of the map to find the cultists. Interrupt the ritual, take the enemies out and complete the task.
You may let Tristian leave this area. But if you let him choose what to do, he’ll stay there to free the Stolen Lands. You’ll get 4800 XP after completing the quest.