Captain Gideon Graymarrow is a figure who has been around since the early days of the Sea of Thieves. A cruel man who never allows his crew to leave the ship.
Over time, he became a Skeleton Lord and sought to learn about the magics of the Sea of Thieves, in effect rivalling the knowledge of the Order of Souls.
His favourite method of dealing with his enemies is to perform a binding curse on them, so as to not allow their souls to pass on to the Ferry of the Damned.
For reasons unknown, his ghost appears when nearing the end of the ritual at the Fort of the Damned.