Douluo Continent, Huo Yuhao who returned from Sekiro

A six-year-old illegitimate son of a duke's family starts from scratch in a strange world, and after countless battles and deaths, becomes an excellent ninja.
The Mortal Blade struck himself, and when Huo Yuhao awoke again, the scene before him had transformed back into the dilapidated courtyard of the Duke's mansion.
At that time, Huo Yuhao was unaware that his destiny had quietly changed from that moment on.
Stance, parrying, anticipation, and various other techniques have been mastered by Huo Yuhao, and his ninja skills are incredibly refined.
As he gradually unleashed the true brilliance of the chosen one, using his unparalleled skills, and repeatedly broke free from the schemes of the dark deities, Huo Yuhao spread the twelve black wings behind him.
"You glutton who weaves a web of conspiracy in the shadows like a spider, you greedy scoundrel consumed by the flames of Asura's karma, I will become your angel of death."
------
Not having played Sekiro won't affect your reading of this book. It's written by a seasoned author who doesn't abandon his projects and writes 10,000 words a day.