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 requires unconventional methods; simply using the helm won't work. You must explore the ship, interact with NPCs, and find a way to activate its unique control mechanism. This involves accessing Magister Dallis' cabin and using the Ancient Empire Songbook.
Investigate Dead Bodies
Begin by searching the bodies of the magisters and ghouls on deck. A Sodden Diary on one corpse contains the password to a stateroom door. You can also potentially acquire the password via a skill check with the northern stateroom door. In addition to the password, you'll need a Strange Gem to access the Portside Stateroom. Note that a magic mirror nearby allows for respeccing characters.
Find the Portside Stateroom
Using the password from the diary (or skill check), access the ship's quarters. Examine the unconscious Bishop Alexander to find the Strange Gem. Use this gem and the password to unlock the southern stateroom door. This leads to Magister Dallis' cabin. The cabin also contains a hidden hatch with two ghouls and a Teleportation Prism.
Find the Songbook
Inside Dallis' cabin, talk to Tarquin and Dallis, exhausting their dialogue options. Locate the Ancient Empire Songbook on the pedestal. Reading it reveals the song needed to move the ship. It's advisable to speak to all NPCs before proceeding, as access will be limited once the ship sails.
Set Sail
Return to the deck and inform Malady about the songbook. She will ask you to sing to the ship. Find the dragon figurine to the west and sing the song. This will start the Lady Vengeance. Be prepared for a challenging battle with powerful magisters immediately afterward; ensure your party is adequately prepared.