Andvari

Andvari had a magical ring Andvaranaut, which helped him become wealthy.

Using a net provided by Ran, Loki catches him as a pike and forces him to give up his gold and Andvaranaut.

Andvari cursed the stolen gold which would destroy anyone who possessed it.

After the deaths of Brynhild and Sigurd, Gunnar left Andvari's gold in a cave.

In Richard Wagner's cycle of music dramas, Der Ring des Nibelungen, the character Alberich is a combination of Andvari and the character of Alberich from the Nibelungenlied.