Darkness Rising

Ciar, the Primordial Oblivion, has been banished to the mortal plane by his progenitor to atone for his sins. Having taken the place of a human baby, Ciar must learn to live in a fleshly body while masking his monstrous nature. At first, he believed this would be easy. However, he soon learns that emotions are complicated things, and his primal instincts may be harder to control than he first believed.

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Ciar will be overpowered, though his power is justified

No Harem will be present, as I hate harems