MTL - The Earth People are so Fierce (Oh My God! Earthlings are Insane!) - Chapter 1607 "World City"

Ethan possessed everything one could desire, wealth, happiness, luxury cars, and a loving girlfriend.He had never fought a day in his life, but then suddenly, he woke up in a different world.A world were destruction and bloodshed was the norm. A world where the weak had no place to survive.Ethan now possessing the body of a boy who had failed his awakening twice and was on his last try, now stood in this world.Can Ethan who never fought a day in his life survive in a world where battles and death occurs every second, minute, hour and day.Would he rise through the ashes of the world, or would he burn with it.

Thousands of years ago, the great abilities of the three teachings of Buddhism, Daoism, and Demonism decided on a place for becoming immortal. Three thousand years ago, a Taoist was close to becoming immortal. Three hundred years ago, the Daqian Dynasty was established, and chaos is expected in another three hundred years. In this era, the path to immortality opens; a celestial swordsman freezes fourteen states with one sword, a heavenly Daoist maiden seeks eternal life, a naturally born Holy Son claims to be invincible, and a Buddhist Holy Monk saves all sentient beings.Gu Wen lives as a beggar, enters a household as a servant, witnessing the disordered world, drifting aimlessly.In a world filled with divine beings, he alone is a mortal.However, a lowly origin is not a disgrace; striving through the grand path, even as a common man and mundane son, he can still be the foremost in the world.“Mortal Gu Wen, my Dao is euqaling the heavens!”

The end of the beginning marks the beginning of a new era. Gods and demons were buried in the past, their history had crumbled into dust. As of now, twelve scriptures were passed down.

With the passage of time, during an excavation, a mysterious scroll of star map was unearthed at Egypt. As if carrying its mission, it abruptly appeared, yet abruptly disappeared. During its disappearance, a youth was brought along with it…

- Description from Novelupdates

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.