Demonic Auctions are magical auctions organized and held by demons and other evil beings. The merchandise of these auctions are powers, magical artifacts, and the souls of magical as beings, who are used as slaves. As with any auction, the merchandise goes to the highest bidder. The currency used in these auctions are often souls or powers.
Demonic Auctions are common in the Demonic Market. The most notable demonic auction was the one the demon Zahn held in his lair in the underworld. Zahn sold the souls he obtained through Faustian Deals for powers. In one of these auctions, he attempted to auction off Paige Matthews' soul after she gave it up to save her boss.