Use Annwn to escort Annwn to Forgotten Palace.
This quest is unlocked in Chapter 3 of the storyline. It is available to Keats during the night by speaking with Ganconer.
Use Annwn to escort Annwn to the Forgotten Palace in the Undersea City. If Annwn dies you will fail the quest.
Notes - If Annwn dies then you will restart where you first met him. Also be careful when you are absorbing… you can absorb Annwn.