Two good examples of the kind of systems I'm looking for are Regressor's Instruction Manual and How to Live as a Villain. In that, the class system is kinda like DND, or at the very least seems like a larger part of the world. Also, I'm not a huge fan of novels with female protagonists due to how hard it was to search for manhwas when I was starting out as a fan, so I'd prefer any recommendations to have male protagonists.