Moonrascals were a type of creature, small and circular. They were extremely mischievous. Aidan Thomas, per arrival into the Realm for the first time, came across one of their tunnels, and entered it—coming out on the other side of the Prince's Crown! Likewise, later, he and Gwenne were spared from the Tempest by Moonrascal's tunnels. They led out onto the opposite side of the Prince's Crown.