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As the Danes slumber, another sinister monster trudges toward Heorot. It is Grendel's mother, who is also dammed to spend eternity in the dark moors. She has passed the day mourning for her dead son, and she comes to Heorot seeking vengeance for his death. When she bursts into Heorot, the warriors awake and grab their weapons. She is not as strong as her son is, but she still is strong enough to devour one warrior and snatch the arm down from its place on the wall. The desire for vengeance points to "the price of slaughter/ with a loved one's life."

Hrothgar hears of the slaughter of his beloved thane Aeschere, and he hurries to the hall to mourn. Beowulf, who slept away from the hall, is summoned. Hrothgar updates him and tells him about the man that Grendel's mother killed. He also tells Beowulf that monsters like Grendel dwell in the dark moors, which are difficult to reach. Beowulf asks Hrothgar to lead him to the moors instead of mourning for his friend. Hrothgar, Beowulf, and their thanes saddle up and ride away.

At the bloodstained lake, the search party finds Aeschere's head. They also see the serpentine creatures that inhabit the murky lake, and they shake with fear. Beowulf simply calls for his armor. Unferth offers Beowulf his own sword, named Hrunting. Beowulf then announces to Hrothgar that his belongings should be sent to Hygelac if something happens. Before Hrothgar can speak, Beowulf dives into the pool.

After a long time, Beowulf reaches the bottom of the lake, where Grendel's mother waits for him. She reaches for him, but his armor protects him. He tries to cut her, but his sword can't cut her. The two begin to wrestle, but neither gains the upper hand in this combat. Beowulf spies a large sword nearby. He manages to grab it, and in one mighty blow, he beheads Grendel's mother.