
This is a hard achievement ( Puritan's Walk) as a lot of things in your playthrough will cause you to die. You could skip the following preparations by walking the Path of Blood and passing Lucians purity test.
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In order to get in the cathedral, you need to complete the quest " The Vault of Linder Kemm"/" Finding Lord Arhu" as you need Lord Arhu to proceed the sub-quest "Wisdom of the Keeper" (which replaced the quest A Craftsman of Dreams and Nightmares) to learn how to enter the tomb of Lucian. Talk to the now ruling Paladin Lord Linder Kemm. Inside Arx, you will learn from some paladins hunting Magisters that Dallis can be found inside the cathedral.

You will need to defeat some Voidwoken on the bridge, starting the quest, " Battle at the Gates". Travel through the bridge to reach the city of Arx. Also loot both the rooms below the hatches north and south of the ship. Don't forget to loot the chest for a powerful unique amulet for mages. Interacting with the Lord Dread will tell you that Dallis is older than it, despite it having lived as an Ancestor Tree and an elf prior to its current form. The harbour has been overwhelmed by the Voidwoken defeat them so you can explore the Lord Dread - Dallis' ship. Speak to Malady, and she will remind you that your purpose here in Arx is to kill Dallis.She suggests that you start searching for her amongst the local Divine Order. This main quest is acquired once you reach Act IV, the Hunt for Dallis. The final battle draws near will you be able to solve the puzzles of Lucian's tomb, or die trying?

Hammerfall is a Quest in Divinity: Original Sin II.
