Tarnhelm is the name of a magic helmet
A helmet is a form of protective gear worn on the head to protect it from injuries.Ceremonial or symbolic helmets without protective function are sometimes used. The oldest known use of helmets was by Assyrian soldiers in 900BC, who wore thick leather or bronze helmets to protect the head from...

 in Richard Wagner
Richard Wagner
Wilhelm Richard Wagner was a German composer, conductor, theatre director, philosopher, music theorist, poet, essayist and writer primarily known for his operas...

's Der Ring des Nibelungen
Der Ring des Nibelungen
Der Ring des Nibelungen is a cycle of four epic operas by the German composer Richard Wagner . The works are based loosely on characters from the Norse sagas and the Nibelungenlied...

. It is used as a cloak of invisibility
Cloak of invisibility
A cloak of invisibility is a theme that has occurred in fiction, and is a device which is under some scientific inquiry.-Cloaks of invisibility in fiction:...

 by Alberich
Alberich was a legendary sorcerer who originated in the mythology or epic sagas of the Frankish Merovingian Dynasty of the 5th to 8th century AD, and whose name means king of the elves , who possessed the ability to become invisible...

 in Das Rheingold
Das Rheingold
is the first of the four operas that constitute Richard Wagner's Der Ring des Nibelungen . It was originally written as an introduction to the tripartite Ring, but the cycle is now generally regarded as consisting of four individual operas.Das Rheingold received its premiere at the National Theatre...

. It also allows one to change one's form:
  • Alberich changes to a dragon and then a frog in Das Rheingold, Scene 3
  • Fafner
    Factoring via Network-Enabled Recursion was a 1995 project trying to solve the RSA-130 factoring problem.It was an internet-based sieving effort from Cooperating Systems Corporation...

     changes to a dragon at the end of Das Rheingold and appears thus in Siegfried
    Siegfried (opera)
    Siegfried is the third of the four operas that constitute Der Ring des Nibelungen , by Richard Wagner. It received its premiere at the Bayreuth Festspielhaus on 16 August 1876, as part of the first complete performance of The Ring...

     Act II
  • Siegfried
    Sigurd is a legendary hero of Norse mythology, as well as the central character in the Völsunga saga. The earliest extant representations for his legend come in pictorial form from seven runestones in Sweden and most notably the Ramsund carving Sigurd (Old Norse: Sigurðr) is a legendary hero of...

     changes to Gunther
    Gunther is the German name of a semi-legendary king of Burgundy of the early 5th century...

    's form in Götterdämmerung
    is the last in Richard Wagner's cycle of four operas titled Der Ring des Nibelungen...

     Act I, Scene 3.

Finally, it allows one to travel long distances instantly
Teleportation is the fictional or imagined process by which matter is instantaneously transferred from one place to another.Teleportation may also refer to:*Quantum teleportation, a method of transmitting quantum data...

, as Siegfried does in Götterdämmerung Act II, Scene 2.


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