As I understood the situation, Elmal was worshipped "improperly", with solar elements (myths, rituals...), resulting in collateral worship of Yelmalio, and maybe some magic from him - worship of two different gods mixed in a single package. Monrogh sorted the mess and separated what was solar/Yelmalio and what was storm/Elmal (which reminds me of the "Yelm is not..." clarification).
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