This guide details how to get the Elven ship, Lady Vengeance, sailing in Divinity: Original Sin 2 after escaping Fort Joy. The process involves a series of puzzles and interactions.
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After removing your Source collar, your goal is to get the Lady Vengeance underway. This isn't done through conventional means; you must discover a unique method. Explore the ship, talk to NPCs, and gather clues. The key is accessing Magister Dallis' cabin and using the Ancient Empire Songbook.
Investigate Dead Bodies
Search the bodies of the magisters and gheists on deck. A Sodden Diary on one corpse contains 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 respeccing characters.
Find the Portside Stateroom Door
Use the password (from the diary or skill check) and the Strange Gem (obtained from Bishop Alexander's regalia) to open the Portside Stateroom door. This leads to Magister Dallis' cabin. Interact with the unconscious Bishop Alexander to find the Strange Gem.
Find the Ancient Empire Songbook
In Dallis' cabin, talk to Tarquin and Dallis. Locate the Ancient Empire Songbook on a pedestal. Reading it reveals the song needed to move the ship. It's advisable to speak with all NPCs before proceeding, as interaction opportunities are lost once the ship sails.
Set Sail
Return to the deck and inform Malady about the songbook. She'll ask you to sing to the ship. Find the dragon figurine to the west and choose the option to sing. This will start the Lady Vengeance. Be prepared for a challenging battle with magisters immediately afterward. Ensure your party is adequately prepared.