It's Season 6 in Sea of Thieves, and that means new mysteries and adventures await. The highlights of this season's new content are the new Sea Forts, housed by phantoms and designed to be quicker takes on the long-standing Forts in Sea of Thieves. Rather than a dozen or more rounds of battling skeletons, these new Sea Forts take only a few minutes to complete, though they retain the lucrative qualities of the legacy Forts. Here's all you need to know about Sea Forts, including where to start them, how to beat them, and what's going on with that Prison Cell Key.

Sea of Thieves - What are Sea Forts?

These pyramid-like fortresses made of stone have emerged from beneath the sea as Captain Flameheart's influence across the pirate realm continues to regain its dominant position. You can travel to any Sea Fort and dodge a few cannonballs before docking and heading inside to fight waves of Flameheart devotees.

After five rounds of the horde-like PvE combat, the Phantom Captain will emerge as your boss to battle. Defeating the Captain will cause them to drop their Fortress Treasury Key, which is used to open the main loot room of the Fort, found just one floor above sea level. Inside that treasury, you'll find lots of Damned treasure--the ghostly green chests, skulls, and supply caches--but all around the Fort either during or after your fight with the phantoms, you'll find other loot scattered about.