In the Thieves Guild questline, during the "Dampened Spirits" quest, it is revealed that Mallus is a Guild associate who plans to ruin his master's business and steal it for Maven Black-Briar. After the quest is completed, he is available as a fence. Unlike ordinary merchants, Mallus, who runs his fencing operation at the Honningbrew Meadery, is open for business around the clock.
- "If you want to buy something, go find Sabjorn. Otherwise, piss off."
- "To tell you the truth, Sabjorn isn't much of an owner. Slave-driver, sure."
- "I've never met someone like him that revels so much in others' misery."