The explanation of how the lines: "his burnie did glisten, his armor seamed over by the art of the craftsman" helps contribute to Beowulf's characterization as a hero is that is explains that he has extremely prosperous objects that appear to present him as a hero
This refers to the character in a story or narration that has extraordinary qualities and is strong and courageous.
Hence, we can see that explanation of how the lines: "his burnie did glisten, his armor seamed over by the art of the craftsman" is given above.
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