The hideous creature of the night was the mother of Grendel, as all knew well.
He lends his sword, Hrunting, to Bewulf for his battle with Grendel's mother, 1456 f.
Grendel now, monster cruel, be mine to quell in single battle!
Of the grip of that Grendel 'neath the great roof upbuilded.
No sword made by mortal men could harm Grendel or his mother; and as he struck her Beowulf stumbled and fell.
Grendel in the poem of Beowulf is in the same order of existence as these portents.
Carrying this and Grendel's head, Beowulf now left the den and swam upwards to the surface of the lake.
It is also a different sort of thing from the fight with Grendel.
Before his encounter with Grendel he charges the king of the Danes to send it back to Hygelac in the event of his death.
Or, whilst Grendel still represents the storms, his antagonist is a "Blitzheros."