MTL - Parasitic Cultivation: Race Clearing System - Chapter 249 Pseudo-S Grade Elixir

In a world where warriors and mages wield incredible power to battle monsters and conquer dungeons, Leon was just another hopeful teenager awaiting his awakening. At eighteen, he stepped forward to touch the Awakening Orb, dreaming of a legendary class—perhaps a powerful Mage or a fearsome Warrior.But fate had other plans.[You have awakened the F-Rank Class: Necromancer][Your subclass is: Zombie Lord]The world sneered. Necromancy was a taboo, a weak class fit for those who couldn't survive real combat. Zombies? Nothing more than mindless, slow-moving corpses. With no future in sight, Leon was cast aside as a failure.Until he actually used his ability.[Select Your Zombie Type]— Warrior Zombie— Mage Zombie— Healer ZombieUnlike traditional necromancers, Leon’s system let him create and customize zombies—giving them skills, equipping them with weapons, and even allowing them to evolve. With the right combination of magic, strategy, and firepower, his undead army could be unstoppable.Armed with a mana-powered magic gun, Leon fights alongside his growing legion of enhanced zombies, proving that an F-Rank class can become the most terrifying existence in the world.The dungeons will fall.The strong will kneel.And soon… the world will know the name Leon, The Zombie Lord

Nessa was transported into a new and completely unfamiliar world where monsters roamed free and survival of the fittest was the supreme rule for the majority of them. In this world, which was beautiful yet dark and cruel, she was given an opportunity.An opportunity to build her own nation after becoming the leader of a few peculiar monsters.Will she be able to overcome those who oppose her, threaten what she is creating, and demonstrate her power to the world in order to achieve peace and acceptance, or will her efforts in this world be futile?[System notifies]Come join Nessa and a few kind souls on their journey to create a nation where monsters, humans, and other creatures can coexist and live happily.

Doomsday comes, and human beings enter the heavenly world.
Ten years later, Yang Chen, who was betrayed tragically, returned strongly with the Tianyu bug. In this life, he vowed to make the betrayal pay the price. He has a powerful bug bonus, just like an open hang. Frightened to hear…

- Description from novelbuddy

Reborn as a sword, he lived for hundreds of years, and then he occupied the body of a 15-year-old prince.