THE SMART TRICK OF ROLL D 20 THAT NOBODY IS DISCUSSING

While looting Thordak's lair, Grog identified the Deck of Many Things. Grog pulled a card from the deck, which was at the outset misinterpret by Matt as The real key card, and awarded him a scarce magic weapon: Dancing Sword. The error was corrected in "Lethal Echoes" (1x82), and was retconned when Grog noticed a medusa-like visage within the blade