Beowulf is a very loved hero. He is put through three challenges with Grendel, Grendel's mother and the dragon. Beowulf thought that having battles and killing people made him who he is. He has a lot of strength and courage.
Battle with Grendel
Beowulf and his men spend the night in Heorot. Beowulf bears no weapon because this would be an "unfair advantage" to the beast. After they fall asleep, Grendel enters the hall and attacks, devouring one of Beowulf's men. Beowulf has been feigning sleep and leaps up to clench Grendel's hand. The two battle until it seems as though the hall might collapse. Beowulf's retainers draw their swords and rush to his aid, but their blades cannot pierce Grendel's skin. Finally, Beowulf tears Grendel's arm from his body at the shoulder and Grendel runs to his home in the marshes and slowly dies.
Battle with Grendel's Mom
Grendel's mom kills one of Hrothgar's most trusted warrior as revenge for the death of her son. Hrothgar, Beowulf and their men track Grendel's mother to her lair under a lake. Beowulf prepares himself for battle. Beowulf dives into the lake. He is swiftly detected and attacked by Grendel's mother. However, she is unable to harm Beowulf through his armour. His amour dragged him to the bottom of the lake. In a cavern containing Grendel's body and the remains of men that the two have killed, Grendel's mother and Beowulf engage in fierce combat.
Battle with The Dragon
Beowulf returns home and eventually becomes king of his own people. One day, fifty years after Beowulf's battle with Grendel's mother, a slave steals a golden cup from the lair of the dragon. When the dragon sees that the cup has been stolen, it leaves its cave in a rage, burning everything in sight. Beowulf and his warriors come to fight the dragon, but Beowulf tells his men that he will fight the dragon alone and that they should wait on the barrow. Beowulf leaves to battle with the dragon but finds himself outmatched. His men, upon seeing this display and fearing for their lives, creep back into the woods. One of his men, Wiglaf comes to Beowulf's aid. The two slay the dragon, but Beowulf is mortally wounded. After Beowulf's death, he is ritually burned, while his people cry and mourn.