For other uses, see Castle of the Worm.

Castle of the Worm is a quest available in The Elder Scrolls Online. The Vestige returns to The Harborage to find an unexpected guest, Abnur Tharn. He claims to know where Sai Sahan is but will only speak to the Vestige. He requests asylum in exchange for the information.


Castle of the Worm is the same for all alliances. However, the closest city will change based on the chosen faction.

Aldmeri DominionEdit


Daggerfall CovenantEdit


Ebonheart PactEdit


Quick walkthroughEdit

  1. Talk to Abnur Tharn
  2. Enter Coldharbour
  3. Talk to Abnur
  4. Talk to Lyris
  5. Find a way into the castle
  6. Go to the Cistern
  7. Talk to Cadwell
  8. Follow Cadwell
  9. Enter the Tower of Bones
  10. Find usable atronach parts (4)
  11. Deliver the atronach parts to the laboratory
  12. Read from the ritual book
  13. Wait for Flesh Atronach
  14. Find Abnur Tharn
  15. Defeat Mannimarco
  16. Talk to Abnur Tharn
  17. Flee the tower summit
  18. Talk to Cadwell
  19. Flee the tower summit
  20. Flee to the Harborage
  21. Talk to Abnur Tharn
  22. Observe the scene
  23. Talk to The Prophet


"What are you doing here? Intruders!"
―Warden Cornexius[src]

The Vestige lands in a village of Soul Shriven and must find a way into the castle when they meet Cadwell. They enter through the Cistern and make their way to Abnur Tharn through the Tower of Bones. On the way, the Vestige have to fight several flesh atornach  and dremoras.

Tharn tell the Vestige and Lyris Titanborn about Mannimarco's plan to become more powerful than Molag Bal and even replace him as a daedric prince, by trapping Molag Bal's essence with the Amulet of Kings and absorb his power, before they get interrupted by Mannimarco himself.

At first, Mannimarco will summon four level 20 skeletons two times. When the Vestige has defeated them, Mannimarco will summon a flesh atronach boss with four more skeletons. 

When the Vestige has defeated Mannimarco, they will have to flee back to The Harborage through the Tower Summit where they'll meet Cadwell. The Vestige can choose to bring Cadwell back to Tamriel or let him stay in Coldharbour.

Back in Coldharbour, Tharn reveals that he doesn't know where Sahan is, only that Sahan is Mannimarco's prisoner. Lyris punches him, and the true identity of The Prophet is revealed.



This section contains bugs related to Castle of the Worm (Quest). Before adding a bug to this list, consider the following:

  1. Please reload an old save to confirm if the bug is still happening.
  2. If the bug is still occurring, please post the bug report with the appropriate system template  360  / XB1  ,  PS3  / PS4  ,  PC  / MAC  ,  NX  , depending on which platform(s) the bug has been encountered on.
  3. Be descriptive when listing the bug and fixes, but avoid having conversations in the description and/or using first-person anecdotes: such discussions belong on the appropriate forum board.
  •  PC   Lyris would sometimes disappear if you died before reaching the cistern. This bug has now been fixed.[1]
  •  PC   Monsters were spawning with levels higher than recommended. This has been fixed as of Update 1.[1]