Varúð

Varúð is a Spellsong that, when used, releases a warm yellow light from each member of the group that creates a Prometheus Cut that overlays their body, entirely erasing them and leaving behind a chaotic, swirling vortex that echoes with the Spellsong instead of the usual static notes. It is essentially the ultimate sacrificial Spellsong. It takes a minimum of 6 people to play. It is named after the Sigur Rós song of the same name.

A visual interpretation can be found here.