Past Life Returner - Side Story 33. The Day of the Auction - Woo Yeon-Hee

When he wakes up, Su Changkong has traveled to a world where troops are chaotic and demons are rampant, and his martial arts qualifications are mediocre, but Su Changkong found that as long as his [lifespan] increases, his talent and potential can be [infinitely] improved!

Wu Qin Xi: imitating tigers, deer, bears, apes, birds and other animals.

Turtle Breath True Dinggong: Imitation Qigong, like a thousand-year-old tortoise breathing, breathing, breathing and closing for a long time, prolonging life!

Celestial silkworm magic: nine transformations of the silkworm, breaking the cocoon into a butterfly, rejuvenating the old and rejuvenating, opening the door of life and death, every transformation is a rebirth!

Cultivation of health boxing, practice the Qi of longevity! There are many corpses on the road of longevity, and Su Changkong has embarked on a longevity martial arts where heaven and earth are destroyed but I am immortal!

- 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.

Perfect. That’s what people call Princess Elysia. Blessed with rare red fire magic and trained by the best, she’s the shining jewel of the kingdom of Arvandor. But perfection has a price. When the ruthless Demon Queen Malvoria sets her sights on Elysia, all hell breaks loose—literally.As Malvoria’s army lays waste to Arvandor, Elysia’s life is shattered. Her beloved father, the king, is slain, and her once-peaceful home becomes a battlefield. Forced to flee with her girlfriend, Zera—the fierce daughter of her magic teacher—and her mentor, Lady Seraphina, Elysia’s journey of survival begins.But Malvoria wants more than just a kingdom. She wants Elysia, and nothing will stand in her way. As Elysia’s hidden powers awaken, an unexpected and dangerous attraction sparks between her and the demon queen.

An underachiever, a chance accident. He gained the premier Cultivation Technique, and from then on, his fate was completely changed.Cultivating superpowers, protecting the campus beauty! With overwhelming strength, he swept through all formidable enemies and made the world tremble with his military might!This is a tale of world conquest! It is also an unbeaten, fiery legend!