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As Merlinus rapidly transformed and evolved into a Demon King, he saw memories of his past, of what he had done and of those he had lost, further making him remember his true conviction. Aside from his hatred towards humanity, towards being a feeble human, and his spite against the immortals who got to be the true protagonists of this world, there was also something.
Some sort of promise he made to his family and to himself, because of his own selfishness, because of the mistakes he committed, and because he deep down still regretted having spent all his time on magic and not on his family, allowing himself to become long-lived and outliving even his children… he had a promise, something he had sworn within his rotten heart.
