Marvel: Start with Level Five Mutants - Chapter 429: Messiah’s Omega Level Powers

Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skill… They are the Demon Lords.

I was proposed to by the Final Boss.

Noboru Chikara is a forsaken prince burdened by neglect and betrayal. Blamed for a devastating attack by his family to protect his siblings, he endures abuse and prejudice from his family and people of his kingdom alike as his family accuses him of being possessed by the very beast that attacked the kingdom. Driven by an unwavering spirit, Noboru sets out to reclaim his birthright and forge a new, uncorrupted kingdom. But when his father commits a heinous act, Noboru's quest takes an unexpected turn, propelling him into a realm beyond imagination. Follow Noboru's journey as he transcends dimensions and becomes the one who bring peace to all dimensions higher or lower and become The God Of Fiction.