Toaru Majutsu no Index: Genesis Testament - Volume 4, Chapter 3: The Counterattack Begins – Boy_not_“Dark”.

“So, you have been lying to me all this time?”She raised her head and realized that the face of her senior brother, one who she knew so well, was unfamiliar and scary.“What are you talking about?” Her senior brother scoffed and shook his finger. “All I can say is that none of you knew who I really am.”He then turned around and walked towards the Sky Throne, a symbol of absolute power.Master Sword Aura, Sea of Flame, Star Light…The dozens of skills that were used to stop the man from approaching the Sky Throne simply bounced off him. All the skills simply vanished into thin air.“No!” Xu Yingling bit her lip and turned to look at An Zhisu and Shi Liuli.They exchanged glances. All the despair, sadness, fear, and even love, were now meaningless. The only thing that was important at the moment was to stop that man.…A cultivation novel. The main character used his cheat ability, Time Travel, to secretly live among all the powerful sects while learning their skills. He eventually managed to gain the power to approach the Sky Throne and become an immortal.However, it seemed that things weren’t going as smoothly as he had planned…”

There are three realms in the multi verse; The Cosmic, the Mortal and the Nether realm.

Hal grew up in the mortal realm with no idea whatsoever of who his parents were.

His love for relics, adventure and the occasional danger would aid him in finding a genie's lamp.

Rubbing a genie's lamp should grant three wishes, but Hal is struck by lightening instead and eventually arrives in the Cosmic realm with a large book in his mind space titled; The Primordial Cosmic Grimiore, that apparently holds all knowledge for a perpetual reign.

And so Hal's journey begins in a little city called Salmon city, in the body of a 17 year old boy also named Hal but was sold into slavery by his own father.

Hal finds out who his mother (prior to reincarnation) whose bloodline now flows unmixed in his new body is....

Join Hal as he battles mortals, Dragons, phoenixes, Gods and many more together with his harem of Beauties for the complete subjugation of the three realms.

William was once a gamer ranked in top 20 worldwide. After his death, he found himself in the body of an insignificant NPC in the game “God's Apocalypse.” This NPC was doomed to die early in the game, filling William with dread because he knew he had only three months to live.The game world of “God's Apocalypse” was rich with many different fantasy races, from elves to dwarves, each offering unique opportunities for him to make use of, as well as challenges to home oneself.William was terrified because he had the knowledge of the game's future but lacked the power to change his fate.However, he was not without options. He retained his game panel and the unique talent “[Jack of All Trades],” which allowed him to learn skills from various professions.William realized that when the game's beta opened, players would arrive. As an NPC, he could assign quests to them and use his knowledge of the game's future to manipulate them to do his bidding.He began to leverage the abilities of the players to alter his fate and grow stronger.William made alliances with various races, gaining their trust and learning their secrets. This enabled him to transcend the boundaries of his initial condition and steadily increase his power.As William's power grew, players in the game started to complain: “This boss is impossibly strong and keeps getting stronger, we demand a nerf!” They were frustrated by his rapid progression and the unique challenges he posed.In contrast, the elves venerated him: “Lord William is the ultimate chosen one, bringing an unparalleled peace to our realm.” They saw him as a savior who brought stability and hope.The mages revered him as well: “He is the trailblazer of magic, our protector. His name, William Cain, is synonymous with the god of the arcane.” They admired his innovative approach to magic and his role in advancing their knowledge.When asked how he managed to achieve such feats, William simply responded, “Knowledge is power, and it's the one thing I don't lack.”

The leaves of the chess game beside Lanke, and there is no one playing chess among the old trees
Xing caused Tian Yuan’s first son, and then looked back at the vast mountains and seas
When he woke up, Ji Yuan became a half-blind beggar in a dilapidated mountain temple.
A real person has a sword and a magic stick has a mouth, which is the foundation for Ji Yuan to settle down in this terrifying world.

- Description from novelbuddy