Tarnhelm is the name of a magic helmet in Richard Wagner's Der Ring des Nibelungen. It is used as a cloak of invisibility by Alberich in Das Rheingold. It also allows one to change one's form:
- Alberich changes to a dragon and then a frog in Das Rheingold, Scene 3
- Fafner changes to a dragon at the end of Das Rheingold and appears thus in Siegfried Act II
- Siegfried changes to Gunther's form in Götterdämmerung Act I, Scene 3.
Finally, it allows one to travel long distances instantly, as Siegfried does in Götterdämmerung Act II, Scene 2.
- It is also an item found in the game Diablo 2.