Beowulf is an exact representation of joseph campbell’s call to adventure.
Where a hero hears about the danger and then must gather himself to cross the threshold and defeat the
guardian of the threshold either by reason or by killing him. The guardian must be killed in order for the hero to make it fully across the threshold and make his way to his final goal.
The guardian is just the first step in the Hero’s journey as he makes himself a long and periolous path that only he can follow with aid.
Beowulf himself starts on his own journey when he hears about the grendal