The Lone KeeperAn OP MC Fantasy Isekai Adventure
What happens when a new Keeper recruit inadvertently eliminates not only the other recruits, but all of the teachers, as well?
At first, when Bax suddenly found himself transported from Earth to an organization of powerful, universe-spanning races, he was thoroughly confused. After he learned that his world was being forcefully inducted into something called the Retrogression System, which would introduce monsters to the Earth while eliminating all of the technology of the Humans living there, he understandably panicked.
Unfortunately, there was nothing that Bax or the Keeper Recruit program that he suddenly found himself being enrolled in could do about it. Instead, he was told that he had to learn how to be a Keeper, which was a powerful protector of the worlds included in the System in which the Earth was now a part. More than that, he was to become a Keeper Guide, a teacher of sorts for future Human Keepers once the Retrogression cycle began anew.
The only problem was that he had been transported from Earth while he was in the early stages of the flu he’d contracted from a co-worker. Bax’s experience being ravaged by the virus was unpleasant, to say the least, but he eventually recovered with enough rest. However, when he finally emerged from his room, ready to really start his learning as a Keeper Guide, he quickly discovered that the rest of the Cooperative seemed to be abandoned.
Now, what is a Keeper Guide recruit to do when there’s no one left to teach him?
This story contains an overpowered main character, LitRPG progression mechanics and stats, and isekai/portal fantasy elements. Contains no sexual content or harems.
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Jonathan Brooks
In the fast-evolving realm of LitRPG and Dungeon Core fiction, few names have carved out territory as boldly—or as prolifically—as Jonathan Brooks. Known for weaving complex magic systems with the logic of game mechanics, Brooks has become a touchstone for readers who crave fantasy grounded in strategy, growth, and immersive world-building.
It all began with Dungeon Player in 2017, a debut that hinted at the intricate worlds and evolving systems that would become his signature. But Brooks didn’t stop there. He’s since written more than 70 novels, building expansive series like Dungeon Crafting, Magical Fusion, and Earthen Contenders, each exploring what it means to level up—whether as a character, a dungeon, or a sentient core learning how to survive in hostile worlds. His latest venture, The Labyrinth World series, continues this evolution with a fresh spin on multiverse mechanics and layered storytelling.
Retrogression Keeper
Retrogression Keeper consists of two books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

