Doomsday: I Obtained A Fallen Angel Pet At The Start Of The Game - Chapter 4

Waking up in a carriage, Wang discovers something was wrong. But due to weakness he finally finds himself in an ancient room. From the moment he comes to terms with his transportation, he has to do everything ti become stronger, due to fear of being killed off anytime.

As someone from Earth, where people had more freedom, he did not feel very safe in a world where slavery still existed with martial arts masters roaming around.

When he discovers the existence of an attribute panel, he decides to take the invincible road.

But things don’t go his way when he survives in the hidden realm with his family only to be ejected into an unfamiliar savage world dominated by the monster clan.

Having to protect his family and become strong while surviving in a world dominated by a simple rule, the strongest fist is the law.

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Chen Shen traveled to a world of immortals and became the corpse collector of the Xianzong, burying the dead disciples every day.

To bury the disciples of the seventh level of Qi training, to obtain their immortal skills and experience, and to obtain part of their spiritual roots.

To bury the disciples of Daofeng’s inner disciples in the array, get the spirit-gathering array, the killing array, and the experience of the array.

Bury alchemy masters, get Peiyuan alchemy recipes, build foundation alchemy recipes, and get alchemy master experience packs.

Bury super geniuses, complete spiritual roots, and achieve heavenly spiritual roots…

Twenty years later, Chen Shen, the body collector who has grown into a Jindan Zhenjun but is still low-key, discovered that the corpses sent this time were unusual, as if they were from the whole sect!

- Description from novelbuddy

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.