Ple-Sen
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I had a different idea. I forgot to write it yesterday. Something like this: he was impressed by the Knights that he was ordered to fight and wanted to become one himself. Then he would travel with a group of adventurers, wanting to find a way to become a "full-fledged Knight," and in the final battle with the main villain, he would sacrifice himself. On his deathbed, he would lament that he never got to fulfill his dream, to which the members of the party would reply that his sacrifice already makes him one of the most worthy knights.