Dragon Ball Legend of Ayaka - Chapter 11

In this world, there exists a throne so exalted, it reigns supreme, governing the fate of all.All the realms of heaven and every race, with countless beings, bow down in submission.Heroes of great worlds vie in a tumultuous struggle, each competing for this highest throne, battling to become the strongest emperor.An unrivaled human prodigy, Ye Chen, succumbs to the most fearsome catastrophe in history only to be reborn. With the memories of his past life, he recommences his cultivation, striving to become an eternal and supreme emperor.Witness the path of rebirth against all odds of a supreme sovereign!!!

Lin Wudao has traversed, and there is an invincible corpse collection system.

As long as you collect the corpses for the strong, you can get the things they owned or touched as rewards during their lifetime, and the obtained items are still strengthened.

Lowest, ten times stronger!

[You collected the corpse of the great emperor Jiang Taichu, and gained ten thousand years of cultivation! 】

[You collected the body of your fiancée Jiang Qingxue, obtained the Zichen Sword, a humane spirit weapon, and after strengthening it ten times, it was upgraded to become an extreme spirit weapon, the Xuantian Ancient Sword! 】

[You collected the bones of an immortal, obtained a ray of immortal origin, enhanced it by 100,000 times, and upgraded it to become the original origin of Hongmeng. After refining it, you can be promoted to the immortal emperor! 】

…

Since obtaining the invincible corpse collection system, Lin Wudao has embarked on an invincible road that can push through the ages and suppress the heavens.

- Description from novelbuddy

Tenjou Yuuya has been a bullied boy since the past.He lives in the home of his beloved grandfather while he goes to school. As usual, he receives a harsh bullying, and he takes an extended absence from school to have some time to heal his wounds.While on this long time of absence, he takes the opportunity to clean his grandfather’s house and goes to a room he never went before, where his grandfather keep many different objects that he gathered from his travels around the world. While he was arranging the objects, he found a door not on a wall among the objects.Out of curiosity he opens this door, what he found on the other side was…

He is an undead who is devoid of all humanity, he is the one and only supreme overlord, he is a man who has severe mysophobia.