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Hm…. Plothole?
From what i understand Humans use magicules from their surroundings and if they make a contract with a spirit they can only use the skills and magic the spirit can use
Otherworlders can have skills, but other than that humans don’t. Why do you think humans need spirits, holy magic, and summoning demons to become stronger. There are probably some exceptions but humans don’t have magicules inside them, so they can,t really get any skills.
Fixed it
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