Thallion appears in Telepath RPG Chapter 2.
Thallion is a wealthy shadowling gem baron, who acts arrogant to anyone near him. He purchased Gamblin' Jack as a slave, but he in unhapply about Jack's lack of enthusiasm for being Thallion's servant.
"I hope you're here on business for your master, and not just barging into my manor univited."
"What are you still doing here? We have no more business to attend to. Begone."
Thallion claims to be a very busy person who never likes people to bother him.