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  • The Lone Keeper

The Lone KeeperAn OP MC Fantasy Isekai Adventure

Retrogression Keeper #1 / 3
by Jonathan Brooks
The Lone Keeper: An OP MC Fantasy Isekai Adventure (Retrogression Keeper #1) by Jonathan Brooks
Unrated

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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FantasyLitRPG
Release date: June 25, 2025

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Jonathan Brooks

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.

Read more ...

What sets his work apart isn’t just the volume—it’s the detail. Fans often point to his grasp of systems thinking, the way he breaks down magical development or skill trees with the precision of a game designer. But beneath the stat sheets and XP bars lies something more: characters grappling with identity, purpose, and consequence. His heroes don’t just gain power—they grow into it, often painfully.

Brooks writes from a place of deep familiarity with gaming culture, but also with a surprising emotional depth for a genre often rooted in mechanics. It’s not uncommon for readers to come for the dungeon crawls and stay for the moral dilemmas and unexpected moments of humanity.

Though much of Jonathan’s personal life remains intentionally off-grid, his interaction with fans through platforms like Patreon reveals a writer who’s both accessible and committed. He frequently shares updates, exclusive content, and invites feedback—an approach that mirrors the community-driven spirit of the genres he writes in.

For anyone seeking stories where numbers matter, choices have weight, and the world itself is a character—Jonathan Brooks continues to deliver, not with fanfare, but with the steady, deliberate grind of someone who knows the value of each level earned.

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.

The Lone Keeper: An OP MC Fantasy Isekai Adventure (Retrogression Keeper #1)
Unrated
The Alternate Keeper (Retrogression Keeper #2)
⧗ 8.00 / 1
The Final Keeper: An OP MC Fantasy Isekai Adventure (Retrogression Keeper #3)
⧗ 8.00 / 1


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