Spoilers: The shipwreck legend. No campaign ending.

Who she is in Total War
Cylostra is unlocked by Curse of the Vampire Coast with Harkon, Noctilus, and Aranessa. She leads The Drowned and uses the same ships, coves, and Infamy. The difference is the army. She summons spectral Bretonnian knights into a flank or onto a gun line that is about to be reached. A Rotting Leviathan is the mount, and a caster on that bulk still needs a crew around her. Deckhands screen. Deck Gunners shoot. A Gunnery Wight or a Mourngul Haunter is a specialist, not a second admiral.
The Academy’s faction effects favour Mournguls and Syreens. The Bordeleaux Flabellum is the named arcane item, tied to public order and to local vampiric corruption. Physical resistance and magical attacks for followers are lord effects.
The singer, the storm, and the Lamprey
The Academy tells it as legend. She was the favourite court singer of the Bretonnian king. She was sent across the ocean to sing for the Phoenix King. A storm hit. The notes became screams as the ship sank, and everyone aboard drowned. Decades later a rotten Bretonnian galleon still sails in savage weather. It is the Lamprey, and she is Madame Cylostra, with a crew called the Drowned.
The roster reveal carries the same wreck and the same fury. Bretonnia in that story is the court she left, not the faction she plays. The Fay Enchantress, Louen, Alberic, and Repanse are the Bretonnian lords. Cylostra’s knights are spectral summons on a Vampire Coast roster. A Bretonnian campaign and The Drowned do not share a treasury.
The other admirals
Harkon rules a Lustrian shore and a broken mind. Noctilus rules the Galleon’s Graveyard and is the count in Phil Kelly’s Dreadfleet. Aranessa is alive, Sartosan, and captain of the Swordfysh. Cylostra is the ghost. All four need the same DLC. Owning one portrait does not unlock another pack.
Use the lord page for the summon, the leviathan, and the guns. Use this page for the singer and the Lamprey. A cove you found, and a war you declared, stay in the sandbox.
Cylostra Direfin: gameplay and availability · More character stories
Sources
- Curse of the Vampire Coast — Total War Academy — academy.totalwar.com
- Curse of the Vampire Coast roster reveal — Total War — totalwar.com
- Immortal Empires DLC Ownership Guide — SEGA — support.sega.com
- Immortal Empires DLC Ownership Guide — SEGA — support.sega.com