@TotallyAbsurd the story has more dnd elements compared to the main manga. I believe that it is closer to the light novel. Her class would be monk, specializing in the combat like that. although I have to admit that her weapon is not something that your typical monk would use, but there are other differences from the dnd such as how they recover spells, what is defined as spell and so on. As for our favorite slayer, he has yet to recieve 5 more years of combat experience. He is 15 and by the start of the main story he is 20. Basically there is only so much you can learn about something without actually doing it.