Beowulf swims to the bottom of the lake determined to kill the"lady monster". The lake had serpents and sea beast in it, Beowulf killed one with an arrow and then continued to the monster's lair.
The dragon battle
After an extensive fight, going back and forth, Beowulf manages to grab hold of a gigantic sword and with it he cuts off the head of Grendel's mom. He then will proceed to cut Grendel's head off of his lifeless body.
A slave just barely escapes from the dragon's den, a jeweled cup in hand for his master. The dragon trying to burn him.
Beowulf tricks the dragon into opening his mouth so, that Wiglaf can throw a stick in the dragon's mouth. With this Beowulf sends the bees to attack the dragon from the inside, leading to the dragon's death.