Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 15 - 15-26. God's Breath

A strange event happened in Blue Star, a large number of Blue Star people were affected by a mysterious force, and their souls temporarily traveled to another world.

It’s a dark, weird world

Not only are the prices extremely high, but there are also many evil spirits quietly appearing. At the same time, various forces are fighting with each other, and the people of the lower classes are suffering.

Yang Fangben, the attending physician of the mental hospital, also traveled through a strange incident.

Fortunately, he found that he had awakened a proficiency panel.

As long as you keep refreshing your proficiency, you can improve your own realm.

He grew up secretly, with corpses piled up under his feet, and he unknowingly embarked on a path of sagehood.

- Description from novelbuddy

Transmigrated to become a disciple of the demon sect, relying on the technique modifier to become a giant of the demon path.

[Detected the technique “Blood Nerve”, relying on devouring blood to cultivate]

[Side effect: easily affected by the spirit contained in the blood, becoming bloodthirsty, murderous, insane, and even brain dead]

[Please wait, system modification is in progress…]

[Ding! Modification completed and side effects canceled]

In a multiverse where countless universes and galaxies coexist, one man named Aadi has reached the pinnacle of power, surpassing all before him. But after achieving his goal, he finds himself at a loss on what to do next. To pass his eternal life with purpose, Aadi opens an extraordinary bookstore in a random world, accompanied by his witty friend, Asty, a white cat.

With his vast knowledge and experience, Aadi takes on disciples, each with their own unique hardships and goals.

Amidst action, adventure, and hilarious moments, Aadi will maintain his ordinary facade while secretly guiding his disciples to achieve greatness. Along the way, he will entertain himself and Asty by playing pranks on unsuspecting customers.

With a focus on the powerful Azure Divine World and the growth of Aadi's disciples, this story promises a thrilling journey through various realms, where different types of disciples, from cultivators to mages and magi, will rise to face their destinies. Join Aadi and his extraordinary bookstore as they navigate the mysteries of the multiverse and uncover the secrets of profound cultivation.

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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.