Calhain

"Argo! I have solved the mystery! Arrest Calhain!" Calhain is a human man who works as a magical advisor to Malwin the Strong, leader of the centaurs of the Scarlet Woods. He claims to have graduated from the Hero track at Hieronymous Wiggenstaff's School for Heroism and Villainy about 10 years ago, but upon being intimidated by Fitzroy and Argo, admits that he was a sidekick, and exaggerated his credentials because he couldn't get a job otherwise.

Upon order of the Firbolg, Argo briefly arrested Calhain for stealing the second apple, but released him after Althea Song explained to the Firbolg that Calhain was just a magical consultant.

In The Adventure Zone: Graduation Ep. 15 “Out of Order," it was revealed that Calhain fled his tent immediately after Fitzroy fell ill, leaving behind a two-way communication mirror that could be used to contact the impostor Hieronymous Wiggenstaff. The Firbolg and Rhodes tracked him to the magical tree, from which he stole the apple, through the tent of the Thundermen, from which he stole a supply bag, and finally to the tent of Malwin the Strong, where he attempted to frame the Thundermen and Rhodes for the apple theft.