Whom does Grendel's mother kill?
Grendel's mother sneaks into Herot and kills Æschere (or Esher), who is described as one Hrothgar's favorite thanes, and a close associate of his. Hrothgar thus asks Beowulf to go and avenge the man's death. This Beowulf promptly does, following her to her lair in a nearby lake There Grendel's mother drags him to the bottom, taking him into her lair. Protected by his mail, he kills her with a magic sword, wielded by giants, that he spies in the hall. In the process, he severs the head of the corpse of Grendel as a trophy. Thus the king's liegeman is avenged, and Beowulf gains even more glory.