Mercury Dragon (Dungeons & Dragons) Wiki.png Alternate Name: Alignment Traits Size Habitat Breath Weapon Treasure The Mercury Dragon (Dungeons & Dragons) is a type of dragon in the Dungeons & Dragons universe. It is a metallic dragon. Mercury dragons are a little bit crazy–but there's definitely a method to their madness. A mercury dragon craves variety above all else. If another creature offers a wide array of food to hunt and the opportunity to gather a hoard, a mercury dragon will serve that creature in an arrangement of convenience. Thus, mercury dragons can be found as champions, bodyguards. and assassins in the employ of greater powers.