Rakuin no Monshou - Volume 3, Chapter 7: Sword’s Engraving

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.

She always knew there was a woman hidden in his heart, so when that woman appeared, she obediently withdrew. However, unexpectedly, he abandoned his 'beloved' and instead frequently invited her.“Mr. Fu, didn't you say there was a contract to discuss?” He pressed her against the cold wall, continuously approaching: “If you were a bit uglier, perhaps I would want to talk contracts and drink tea with you, but you're so beautiful, I only want to talk love with you.”To him, Qiao Mo was like his most cherished treasure, and whenever others looked at her, he felt they were trying to steal her.

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

Living life in this new world was already hard enough....So why?Why is the villainess of this world obsessed with me?