SSS-Class Zombie Overlord: My Undead Legion Evolves Infinitely!

The apocalypse brought monsters, death, and ruin to Earth. As humanity struggled to survive, countless people awakened as Players and gained classes to fight back against the creatures that threatened their world. Amongst this chaos, a zombie wandering the wastelands unexpectedly regained consciousness. Though he had once been human, he was now one of the undead. As the first zombie to mutate and gain intelligence, he awakened a mysterious system and obtained a unique class. [SSS-Class: Zombie Overlord] In a world where the undead are hunted relentlessly and monsters grow stronger by the day, survival is anything but guaranteed. Fortunately, he is no ordinary zombie. By devouring corpses, mutating his body, and evolving his undead followers, he can steadily transform himself into something far more terrifying. From a lone zombie hiding amongst the ruins to the ruler of an ever-expanding undead legion, his rise has only just begun. — Description from novelcodex.org