I know his grandfather's death had a place in it, but I dont think its fully responsible. Was it a mix of latened atmokinesis/hydrokinesis and the emotions regarding his abusive grandfather's death just brought the ability out? Can other humans do it, if they also entered a trance like state?
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He saw dark clouds and thought it might rain on which he proclaimed he caused the rain, theres no way without vaporising water that a human can cause rainfall