What is the question to this?
The purpose and effect of Beowulf describing his own great deeds rely on showing how confident he is about his strength and bravery to fight the monster. In this way, he is demonstrating his honor and fearless pursues to others.
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Answer: I'm pretty sure the answer is a theme of darkness and fear.
Explanation: I read part of the poem, and it seems to be pretty dark. I hope this helped :)