Final answer:
The heroic trait shown in the given lines from Beowulf is a powerful sense of duty.
Step-by-step explanation:
The heroic trait shown in the given lines from the epic poem Beowulf is a powerful sense of duty. Beowulf demonstrates his unwavering commitment to his duty as a hero by stating that no one else in the entire world can defeat the creature he is about to face. This exhibits his strong belief in his responsibility to protect his people and his determination to achieve victory in battle.
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