You can visit the site earlier than this, however there is a fateshift door that prevents you from travelling through the dungeon fully.
While visiting the tomb with Gwyn Anwy, she reveals upon entering that it was here her mother travelled to before disappearing. Her (mother's) body is found in front of the sealed fateshift door.
It is also here that the Warsworn questline is finished, with the Fateless One being awarded the title of Truesworn, an honour only one or two people receive in a lifetime (this presumably means every 100 years or so).
- Unlocked chest x 4
- Very Easy-lock chest x 1
- Skill Book of Blacksmithing - in one of the unlocked chest next to the Forge