Curse of the Golden Scales
Devout follower of Bahamut. When he went to the Crypt of Enigma, he was captured, and his soul was taken from his body. The companions were given a choice between his soul and Shiro and they chose to save shiro. As such, Garthon’s soul was banished to the Shadowfell. Time will tell what the corrupting energies of that plane will do to the fallen paladin.