LitRPG, short for Literary Role Playing Game, is a literary genre combining the conventions of RPGs with science-fiction and fantasy novels. Games or game-like challenges form an essential part of the story and visible RPG statistics (for example strength, intelligence, damage) are a significant part of the reading experience.
Between the Good Guys, Bad Guys, and now the Grim Guys series, The Universe of Vuldranni is one of the most thoroughly flushed out I have seen in the litrpg space.