Exclusive Property: Mr. Mu's Favorite - Chapter 220

Chi Lang transmigrated to the Middle Ages as a third-rate magician in a third-rate magic academy. His magical aptitude is zero. But he has a good roommate.

His roommate is good-looking.

His roommate is good-natured.

His roommate helped him escape from danger several times.

His roommate never complains.

Chi Lang felt like he liked his roommate a little bit, and then his roommate helped him solve his ‘single’ problem.

It wasn’t until much later that he realized that his roommate was a remarkable figure.

——He was one of the demons sealed by the magician known as the “God of Magic”… And Chi Lang became the one who unlocked the seal of the Demon Lord.

- Description from Novelupdates

To save a doomed fantasy world, I killed the main characters, then destroyed the game world, and fell into another timeline as the academy's top seat and rival to the protagonist.Now, I'm trying to save the world and steer it towards a better ending…But I'm the final boss.

It had been hundreds of years since humanity and their Witch allies had been forced to retreat to the fortress cities after the disastrous war to eliminate the Magi Clans.

Nuclear weapons had burned the skies, and Grand Magic pulled entire continents beneath the seas before the end, but the victory was secured, no Magi was left alive in their slowly recovering world.

Or so they thought.

Wolfe Noxus was born on the lower levels of a fortress city run by the Morgana Coven, raised under the glow of magical lights, with magic and technology entwined in every aspect of his life.

But after his eighteenth birthday, when a get rich quick scheme led him to the forbidden ability to use the powers of the Magi, his whole life would change.

The forbidden inheritance of the Magi was his. All he had to do was live long enough to embrace it.

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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.