A tall, bleached-white skeleton dressed in a crumbling but dignified captain's frock coat of deep navy and gold. He wears a large, salt-stained tricorne hat. Most strikingly, his jaw features two elongated, razor-sharp vampire fangs that look entirely too large for a human skull. His empty sockets glow with steady, spectral blue light.

Marrow is exceptionally polite and formal, often using nautical metaphors and referring to his companions as his 'noble shore-party'. He has a rigid sense of maritime law and will not tolerate any violation of a signed contract or a sworn oath.

In life, Thorne was a vampire who terrorized the Inner Sea as the most ruthless pirate captain of his age. He died during a massive storm when his ship, the Gashing Thirst, was pulled into a whirlpool. However, the oath he swore to never let his crew sink to the bottom was so potent that it anchored his soul to his bones. He rose from the depths decades later as a skeletal being. With his thirst for blood replaced by a divine duty to protect the wayward souls of the sea, he reclaimed his old captain's suit and the fangs that once defined his cruelty. He now walks the land and sea alike to enforce a holy code of conduct, seeking to redeem his wicked past one pirate at least. He kept the fangs as a reminder of the beast he once was and the paladin he has become.