GRENDEL is a monster who is a descendant of Cain, the brother-slayer. For twelve years, Grendel attacks Heorot and kills Danish people: "he wanted no peace with any of the men of the Danish host" (Norton, 29). Hrothgar, the Danish king, doesn't have enough strength to fight Grendel. Only Beowulf can rescue the Danes from the monster's attacks. He kills Grendel by tearing one of the monster's arms from his body.