Rex Darkculler was a priest of Erythnul who had somehow even managed to fall from the vicious graces of the cult of that evil god. Unscrupulous and probably insane, he worked as a mercenary out of Skullport, frequently working for the Agents of the Eye as a bounty hunter. His particular specialty was brutal massacres of an incredibly bloody nature, and he made a good hit man if the friends of the target needed impressing how incredibly important it was not to offend whoever it was that had been offended.
Rex was sent to bring Garrett down from Firetop by the Agents of the Eye after Jaxsen flagged him up as a good recruit. Unfortunately, on the return journey down the Castle Corkscrew, Rex was killed by a giant scorpion. Garrett did nothing to help his reputation in the city above by wearing the dead cultist’s armbands for some time after, which were embossed with symbols of the god of slaughter.