Vost is a member of the Dark Conspiracy. He was a trusted Vizier to Duke Elkis when the party discovered his involvement in the conspiracy. He was captured but soon escaped. He is now at large.
Prior to his discovery, Vost was romantically involved with another conspirator, an Ice Witch, though her identity is still unknown, though the party discovered her lair on Tard Island.
One of the party members had a vision, where they witnessed Vost kill the Ice Witch.