How or does this work reflect the reality of medieval culture?
In order to answer this question, you need to imagine that you know nothing about the Middle Ages and this is the only artifact that you have. Even though it is fiction and contains magical mystical things that are not part of reality, what do we actually learn about life in the Middle Ages? Think about the way people treat each other, what is important to them, how they speak, what they wear, what they do, etc. Instead of answering the questioning for you, this should give you the tools to answer it yourself. And yes, it does reflect medieval culture.