Answer:
The next night, after celebrating Grendel's defeat, Hrothgar and his men sleep in Heorot. Grendel's mother, angry that her son has been killed, sets out to get revenge. "Beowulf was elsewhere. Earlier, after the award of treasure, The Geat had been given another lodging"; his assistance would be absent in this battle. Grendel's mother violently kills Æschere, who is Hrothgar's most loyal fighter, and escapes.
Hrothgar, Beowulf, and their men track Grendel's mother to her lair under a lake. Unferð, a warrior who had earlier challenged him, presents Beowulf with his sword Hrunting. After stipulating a number of conditions to Hrothgar in case of his death (including the taking in of his kinsmen and the inheritance by Unferth of Beowulf's estate), Beowulf jumps into the lake, and while harassed by water monsters gets to the bottom, where he finds a cavern. Grendel's mother pulls him in, and she and Beowulf engage in fierce combat.
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