Lore
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Aisumar was an angel whose purpose was to protect valiant lives during battle at no matter the cost. Then a demon (can't think of female names) swayed him to corruption, causing his fall from the legion, she took him into the underworld where she fed him lies to fuel his anger for all the people he was sworn to protect selflessly and this augmented him and transformed him into a demon of hate
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Also, if you'd like to flesh out the lore a bit more I'd love to hear it! Also I wouldn't mind getting some suggestions for flavor text XD