Ultimate Villain's Return as a Doctor in the Cultivation World - Chapter 94 - Mating After 300 Years?

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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JAYDEForged in the crucible of Xi Corporation’s labs, Jayde—once known only as SN1098—is a genetically engineered super soldier, her body honed to a razor's edge through decades of fighting humanity’s brutal wars. Her rebellion against her creators sparked a desperate battle for her people’s survival, only to end in betrayal and a fiery death on Crypso 3Q3U, her sacrifice shattering the corporate chains binding thousands of GESS lives. Yet death is not her end. Jayde awakens, impossibly, in the tortured body of a young girl on a strange world untouched by the technology she knew—no starships, no replicators, no blasters, only the primal pulse of magic. Bound to an ancient artifact pulsing with secrets, she must navigate a realm of powerful mages, mythical creatures, and lurking monsters, her old instincts clashing with the arcane forces now at her command. Her soul, scarred by battle and betrayal, carries a darkness that threatens to consume or redeem her as she carves a new path.RENRen, the fierce demon king, stands as the last bulwark against his race’s extinction, his heart a furnace of primal fury. To save his people and halt the malevolent Zartonesh’s invasion of the realms, he must venture to the Lower Realm, where the Devil Wars first ignited. His fate entwines with a young woman—Jayde—whose soul, steeped in shadow, stirs the ancient beast within him. Her vast, untamed power could be the key to salvation or the doom of all he fights for, her presence a spark to his fire, a bond that could forge or shatter destinies.AN EPIC JOURNEY OF MAGIC AND REDEMPTIONJayde trades her blaster for a sword, stepping alone into a universe where magic hums like a Centauri war-chant, guided only by a mysterious artifact that whispers of forgotten truths. She journeys across dimensions, learning the art of spellcraft, forging alliances with unlikely companions, and facing enemies born of myth and nightmare. As she grapples with the darkness within her soul—a remnant of her past life’s pain and betrayal—she searches for her true-mate, a bond that could anchor or unravel her. Will she master the magic of this strange world and rise as its savior, or will the shadows she carries bring ruin to all she holds dear?WARNING: This tale unfolds as a slow-burning romance, weaving love and loss through a tapestry of magic, sacrifice, and defiance, as Jayde’s legacy burns brighter than any star.

A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

Ye Chen transmigrated to a fantasy world and realized that he had seven seniors in his clan, and all of them were of stunning beauty.