As Sukuna in Invincible - Chapter 4: Normal Day

Tang Long was brought to the Immortal Cultivation World by an immortal who noticed his affinity to wood and cultivation.
Relying on his amazing talent, became one of the five emperors of that world.
He failed his Heavenly Tribulation and had his soul scattered into pieces but one part found its way to Qin Haodong on Earth.
With his excellent medical skills, he became a divine doctor of traditional Chinese medicine and encountered the baby girl he made before going into the Cultivation World, whose mother was as pretty as a fairy. The little girl even asked him to find more lovers. What a cute girl…

Loose cultivator Shi Lang gradually found himself in the realm of invincibility. However, when he finally tried to ascend to the higher realm, the spirit of the world was nearly exhausted.

So, between his ascension to a new world or the well-being of his home, he chose the latter and sacrificed his life to save the world.

Nobody knew what he gave up for the world, and he told no one.

Although his sacrifice had gone unsung, there was still someone who witnessed everything. A treasured artifact he carried on his body preserved his soul and let it escape a tragic end.

Eons passed.

The human race stepped out from the age of cultivation into an age of stellar conquest.

The spirit energy in the world was now scarce, but humans found other means to excel.

In this highly-advanced time, Shi Lang's soul has found a chance to be reborn.

What happens when an ancient cultivator that neared the level of a deity before his first death gets a second chance at life in the space age?

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.

[ era Wen ] died after experiencing the apocalypse for ten years. He wore the clothes of a newlywed wife who was despised by her husband's family. He fought with the best, abused the scum, and changed the fate of the apocalypse. In the 1980s, she was living well.And he was a strong and overbearing prince charming. He was professional in protecting his wife, and in order to repay his kindness, he married a fat wife. One day, he realized that after his wife woke up, she was a completely different person... ...Lin Lei: "Song Yi, I want a divorce. It's not suitable for us to have a generation gap! ".Song Yi: "Don't even think about it. You will be my wife for the rest of your life. If you want to leave me, no way! "Lin Lei: "You Scoundrel, I'm not your wife! "Song Yi: "I forgot. Then let's make our relationship real now! "[ explosive love story + 1V1 + double purity + power + fantasy ]