Fortifying the Sea is a quest in Tyranny.
With the passage into Howling Rock now available, enter the Earthshaker compound and negotiate an alliance.
- Approach the fort and talk to Isadora, then enter the compound. Head west.
- Meet Radix Ironcore. If you killed Caedis, he will accuse you of murdering his baby brother. You can attack and kill him, allowing Isadora to lead the guild, or convince him with Subterfuge 45 that it was the Chorus. Honest.
- Talk to Radix and/or Isadora, making your case for an alliance. You will be asked to aid with the Ritual of All Stones and The Rise of the Earthshakers.