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He becomes a lesha because he believes nain would love and treaure him more. Cause he is jealous of gwen and how close nain is to gwen. Also the leshas may be called concubines but they are not used for that they are usually chosen as human sacrifices.
Also Amon only ever has sex with nain

this manhwa is a lot more enjoyable and easy to understand if u read the novel guyss it’s good