For 10 points, name this stalker of Heorot, the first monster slain by Beowulf.
In one novel, this character tries and fails to scare off a ram and later gets stuck in a tree, where a bull tries to knock him out. This character is commanded to sing of walls after he slips on blood, and he is previously told by a dragon to find some gold and sit on it. In another work, this character's blood melts a sword when his head is cut off. He is unable to approach the throne in that work because he is said to be a descendant of Cain. Another character pretends to be asleep before fighting this character unarmed, and this character runs back to his cave to die after his arm is pulled off. For 10 points, name this stalker of Heorot, the first monster slain by Beowulf.
In one novel, this character tries and fails to scare off a ram and later gets stuck in a tree, where a bull tries to knock him out.
Grendel