When the hero Sigurd (Sigurðr) slayed the dragon Fafnir, he took the Helm of Awe/Terror, Ægishjálmur, from the dragon’s hoard. Sigurd’s helmet, (called Tarnhelm in Wagner’s the Der Ring des Nibelungen),supposedly had many powers, such as making the wearer invisible and allowing him to change shape at will. In the Völsunga saga, Stanza 16 of Fáfnismál, the dragon Fafnir says:
The Helm of Awe I wore before the sons of men In defense of my treasure; Amongst all, I alone was strong, I thought to myself, For I found no power a match for my own
Handmade by master artisans, the Siegfried's Helm, Ægishjálmur has a width of 24mm and weights 14g. The faceplate of the helmet opens, revealing the skull of Sigurd.