BLOOD MUTANT SYSTEM. - Chapter 7: CH:SYSTEM ACQUIRED.

Returning to the Mysterious Era features a boy who can time-travel back to the past using old relics. The twist? He’s stuck in the body of the relic’s owner.After a near-death experience, Cassius unlocks his ability to travel to the past in the body of Li Wei, a member of the Wind Elephant Sect. Li Wei was a coward who lived a life of regrets up until the day the entire Wind Elephant Sect was mu*dered. As Cassius relives Li Wei’s past, he makes different decisions to show Li Wei a different kind of future.By living out the ups and downs of Li Wei’s life, Cassius is introduced to the world of Covert Martial Arts, ties that run closer than blood, and supernatural forces. Crossing the line between the ordinary and supernatural, he realizes there’s no way back. New friends and enemies slowly integrate into his reality.Now, he must uncover the secrets of Covert Martial Arts and get stronger to survive.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Li Feng found himself in a dangerous demonic sect where he could be killed at any moment. But he was worried as he had his ultimate upgradation system.Blood Essence Pill -> Blood Origin PillTurtle Breathing Mantra -> Xuanwu's Great IsolationPhantom Spirit Fox -> Nine Tailed Celestial FoxJust like that, Li Feng was confident that he would be able to become stronger at a very fast pace and would be able to survive in this dangerous demonic sect. Not only that but as his parents were killed by some of the disciples of this demonic sect, he was also going to take his revenge on them. With his system's assistance, Li Feng was confident to reach the pinnacle of cultivation.

“Failed writer. Failed hunter. Failed at life.”Aiden Jus had heard it all before. At twenty-eight, he was a walking reminder of what happened when you failed your mana awakening and spent thirteen years chasing a dream that would never come true. No powers. No future. Just a cramped flat in the UK and a lifetime of rejection letters from publishers who never bothered to read past the first page.But the day Aiden decided to give up on writing—the day he was ready to finally accept a soul-crushing desk job at an editing firm—everything changed.*[You have been chosen by Nabu, God of Literacy and Scribes]**[Skill Acquired: Narrative Embodiment (Divine-Rank)]*The ancient Mesopotamian deity offered Aiden something unprecedented: the power to physically enter any story he writes and gain real abilities from the fictional worlds he creates.*[You have mastered Celestial Blade Art - Skill permanently acquired]**[You have learned Tier-9 Spell: Void Severance - Spell permanently acquired]*Every sword technique mastered, every spell learned, every power gained inside his stories becomes permanently his in the real world. But so does every death trap, overpowered villain, and narrative cruelty he carelessly wrote in moments of frustration.Suddenly, Aiden isn't just a failed writer anymore. While other awakened humans rely on mana cores and dungeon raids, Aiden's strength comes from the worlds born from his imagination—a power that operates outside the traditional hunter system entirely.As rival gods compete for powerful human contractors and ancient ruins promise unimaginable treasures, Aiden must survive the deadly fictional universes he created while building his reputation in a society that once dismissed him as worthless.**From the typewriter to the battlefield, Aiden Jus will prove that the pen truly is mightier than the sword—as long as you're willing to live through every word you write.**