Gwent was an overseer in Farhold, who specialized in brewing and alchemy.
Balogun forged a letter to Gwent as a mean of entering the town, after which the party was granted an audience with the busy overseer. When Balogun accompanied him alone into the keep, he quickly found out that the overseer were monstrous and not human at all, solidifying the claim that at least some of the overseers were monsters disguised as humans.