Eatons (Giants)
In the Battle cave when Beowulf is fighting with Grendel's mother.
While fighting Grendel's mother Beowulf finds his sword does not work against the monster. He discards it and takes Grendel's mother's weapon. Most men would not be able to lift it. He then beheads the monster.
Beowulf finds Grendel's mother lurking in the corner of her underwater lair when he ventures there to avenge the death of the Danish king Hrothgar's advisor. She is a formidable opponent and a key antagonist in the Old English epic poem "Beowulf."
Beowulf uses a giant's sword to kill Grendel's mother in their underwater lair. He finds the sword hanging on the wall and uses it to strike a fatal blow.
With a giant sword hanging in her underwater cave. He beheads her. Edit by Afewmangos: This is a more specific answer. He travels down to the bottom of a swamp/lake in the middle of the forest, where Grendel's mom tries to choke Beowulf to death. Beowulf manages to escape. Then he spies a very old sword called Hrunting hanging from the wall. He grabs it and beheads her. The blood from the monster melts the blade of Hrunting, and Beowulf carries back to Hrothgar just the remaining hilt.
In section XIX of Beowulf, Beowulf swims in the sea to reach the underwater lair of Grendel's mother. He engages in a fierce battle with her, ultimately killing her by beheading her with a sword he finds in her lair. Beowulf then presents the head of Grendel's mother to Hrothgar as a trophy of his victory.
These lines from the poem "Beowulf" refer to a sword that the Geat warrior finds among the treasures in Grendel's mother's lair. The sword is described as an ancient, giant-made weapon with an extraordinarily sharp edge. It is a prized heirloom and an unmatched weapon, except in the hands of an exceptional warrior like Beowulf.
The poet credits Beowulf's own strength, courage, and determination for his victory over Grendel's mother. Beowulf's unwavering resolve, combined with the help of a magic sword he finds in her lair, ultimately leads to his triumph.
Beowulf dives into the lake where Grendel's mother lives and swims down to her lair. There, he engages her in a fierce battle using a magical sword that he finds in the lair. Beowulf eventually defeats Grendel's mother by decapitating her with the sword.
After Beowulf harms Grendel, the mother breaks into the hall to take his arm home. Beowulf is told by the king that htere are actually two monsters. Beowulf leaves at once to go underwater to kill Grendel's mother.
Beowulf first fights Grendel, a strong monster. Beowulf finds his weapons do no work against Grendel. He then fights Grendel with his hands. Beowulf rips off Grendel's arm and he runs away.
Beowulf kills Grendel's mother by using a sword on her.