Elf Tensei Kara no Cheat Kenkoku-ki - Chapter 2Book 4: -: Secret Maneuvers

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

What if something made Naruto the dead-last that everyone perceives him to be? What if he really wasn't as weak as he appeared? The true Naruto, unleashed upon the shinobi world! AU story starts at the Konoha Invasion arc and continues from there..

Zane Thaleward, born into a prestigious family known for their extraordinary magical abilities, struggles to meet the expectations placed upon him. Unlike his relatives, his magic is weak, limited to only the simplest of spells, making him the subject of mockery and ridicule.Despite the constant criticism, he remains determined to become stronger. One day, while searching the family’s library for a way to improve his magic, he stumbles upon a strange, ancient book. Little does he know, this discovery will change his destiny forever.

A young juvenile’s dantian was sealed since childhood. He can learn all elementary laws and master all martial art techniques. Various Kings strive to reach the heavens, new warlords rise together simultaneously, great races stand with thousands of numbers. From the moment that youth awakens, Everyone will shiver in his presence…….Humans unfair to ME, millions of corpses on the ground.