In this fantasy world there are a small number of people with magic blood, people with 100% magic blood are called pure bloods, people with 50% magic blood are called mud-bloods and people with no magic are called muggles. There are 4 main houses in hogwarts including griffendor, ravenclaw, hufelpuff and slytherin. The headmaster of hogwarts it an old powerful wise wizard called dumbeldore. Magic beasts exist in the magical world as well and some are even for example a dementor.