The feared demon lord who was broken by the world

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The demon lord, the most powerful being in the world had asked for the most beautiful woman in the world as a bride for him. No one knows how he looks like as in his human form, he always wears a mask, only leaving his eyes exposed. He also has another form in which he turns into a massive wolf monster who is 10ft tall. He is feared by everyone because of his lack of mercy, wrathful and vengeful personality. But he is relatively gentle as compared to other monsters.