Asgard, though formally the name for the realm of the Norse/Germanic gods, has come to be used informally as the name for both the realm of Asgard and its associated realms, including Jotunheim (realm of the Frost Giants), Svartalfheim (realm of the dark elves such as Malekith), Niffleheim (realm of the dishonored dead ruled by Hela), and Muspelheim (realm of the fire demons). Home to Thor Odinson, Odin Borson, and Loki Laufeyson, it is a world visited in several of the Kingdom Hearts Unlimited stories, with events based on Marvel Studios' Thor films and associated works.