Beowulf kills Grendel's mother with the help of the sword which hangs on the wall nearby.
As Grendel's mother lures Beowulf deep down into the lake, she firstly overpowers him. Beowulf tries to attack her with his sword Hrunting, which is lent to him by Unferth, by swinging it to her head, but it is unable to pierce the monster’s skin.
At last he sees a sword nearby, which is hanging on the wall. The sword is an enormous weapon made by the giants. Beowulf gets hold of the sword and swings it in a powerful stroke. The weapon slices through the neck of Grendel's mother, thereby killing her.
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