This guide details how to get the Lady Vengeance sailing in Divinity: Original Sin 2 after escaping Fort Joy. This involves a multi-step puzzle.
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After removing your Source collar, your goal is to get the Elven ship, Lady Vengeance, moving. This isn't done through conventional means; you must find an unconventional method. Explore the ship, talk to NPCs, and gather clues. The key is accessing Magister Dallis' cabin and the Ancient Songbook within.
Investigate Dead Bodies
Search the bodies of the magisters and ghosts on deck. A dead magister holds a Sodden Diary containing a password for a stateroom door. You can also obtain the password via a skill check with the northern stateroom door. You'll also need a Strange Gem, found later, to interact with the door. A magic mirror nearby allows for respeccing characters.
Find the Portside Stateroom Door
Using the password from the diary, enter the ship's quarters. Interact with the unconscious Bishop Alexander to find a Strange Gem in his regalia. Use this gem and the password ("Fortitude") on the southern stateroom door to access Magister Dallis' cabin. This cabin also contains a hidden hatch with two ghosts and a Teleportation Prism.
Find the Ancient Empire Songbook
In Magister Dallis' cabin, talk to Tarquin and Dallis extensively. Locate the Ancient Empire Songbook on a pedestal; reading it reveals the song needed to move the ship. It's advisable to speak to all NPCs before proceeding, as interaction will be limited once the ship sails.
Set Sail
Return to the deck and tell Malady about the songbook. She'll ask you to sing it. Go to the western part of the deck, interact with the dragon figurine, and choose the option to sing. The Lady Vengeance will begin to move. Be prepared for a challenging battle with powerful magisters immediately afterward. Ensure your party is adequately prepared.