This page of the guide to GreedFall has the walkthrough for Demonical Cult, one of the main quests in the game.
You start this quest after completing Old Countries in a New World. After talking with Constantin, you go in search of a demonical cult. Go to the village pointed by Petrus in Tir Dob. "The Black Lands" and talk to the missionaries sent by Mother Cardinal.
Start questioning the village leader and residents. Some villagers won't talk to you - try to find people who are far from the center of the village. After that, pass all the information to sister Ephesia.
One of the residents was very nervous during the interrogation - go to the woman standing nearby first and ask her for help. If you have Siora in your team, the villager will help you distract the suspect. Use this opportunity to get inside and carefully search the hut for evidence.
Go outside and tell everything sister Ephesia again. Go to the specified location, watch the cut-scene and then start following the nervous man. Try not to be caught. After a while, you will reach the circle with the elements. Your character will have a vision. Your new task is to solve the puzzle.
You have to click the corresponding monuments in the correct order - according to the vision your character has experienced. The correct combination:
- Wind Stone
- Lightning Stone
- Fire Stone
- Death Stone
- Water Stone
- Life Stone
After lighting the candles in the correct order, go into the cave. Go to the center of the cave and watch another cut-scene. After that, go back to Derdre. The quest is complete - you get 1,700 XP and start Face to Face with the Demon quest.