This magical sword was lent to Beowulf by Unferth in order that it might help him defeat Grendel's mother. The weapon possessed great power and had never before failed anyone who used it. However, the sword proved ineffective against the demon. As the "fabulous powers of that heirloom failed," Beowulf was forced to discard it.
Unknown, “Hrunting,” The Museum of Fictional Literary Artifacts, accessed May 16, 2022, https://mfla.omeka.net/items/show/119.