Naruto: The Chosen Undead - Chapter 82 - no. Naruto

A mysterious teenager who had lost his past, awakened in Tianlong Continent. Mistaken as the Ye family’s Son, he used this identity to observe this chaotic world and to search for his past self, but only to find an inevitable and terrible fate, therefore he indignantly laughed at his destiny, and revealed his prowess to rule the lands under the heavens.

A back-to-basics(?) monster evolution novel.

Shaymon, the man who has achieved the apex of dark magic, is framed as being a Demon King and is killed.

On the surface, he is the aloof and standoffish patriot whose sole purpose is to serve the nation. On the darker side, he is an invincible, powerful and mysterious man.