Privateer: Misery Cage
Misery cages are a cruel twist on the gibbets used on the mainland to punish pirates. While a mundane gibbet holds a living prisoner to waste away, a misery cage wrings arcane power from the flesh and souls of any locked away within. Cryxians stuff the dead and dying into misery cages so warcasters can draw upon their essence to fuel their profane magic, which renders the body within to crumbling ash, a terrifying but relatively merciful end.