I can rewind time to prevent death - Chapter 19 - 18: The Highest Level Task at Present

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

Luo Xing travels through the world of pirates and obtains a system of increasing defense power. When he receives different degrees of damage, he will increase the defense points of the corresponding level.

Luo Xing started from Wano Kingdom’s Hundred Beasts Group, step by step towards becoming the strongest.

“Come on, Yamato, hit me, you’re welcome!”

“General Akainu, did you not eat enough in the morning? Why is the magma so warm?”

“White Beard, your Zhenzhen Fruit should be even stronger, right?”

Luo Xing continued to challenge the strong, and what broke the strong was that Luo Xing became stronger and more fleshy, and in the end they couldn’t even break Luo Xing’s skin.

Teacher Kai shouted loudly: “Among the people who have fought against me in terms of defense, no one is more fleshy than you. I, Kaido of Beasts, would like to call you the strongest creature!”…

- Description from novelbuddy

Apollo Kaiser, a boy who bore the unlucky fate of being unable to grow strong, was condemned by his family.

Discarded by his mother and abused by others, Apollo gives in to his rage.

However, this action results in his death. Many would believe it to be the end, but Apollo's death was a required catalyst.

The Demon Monarch System finds its heir and attaches to his soul, bringing him to a new world where he starts his journey to supremacy.

This difficult journey rife with conflict, conquest, and brutality shall serve as Apollo's temperance.

Watch as the heir of the Demon Monarch rises above all, conquers Sin, subjugates unthinkable enemies, and even brings about the destruction of worlds!

The rise of the next Demon Monarch begins...

Read at least six chapters, then prepare to crave the rest.The main character will show up in Chapter Five, though I don't recommend skipping the first four chapters.-----The world was celebrating. The Demon King was dead, along with his Darkness Generals.Humans led the other races to war for subjugation. They killed all, and none were spared. However, thousands of years before this happened, a piece of history was altered by time itself. In fact, the Demon King didn't have four generals but only one, which he sealed and sent into eternal slumber. Just as he started to close his eyes, the chains locked away for eternity shattered into pieces.