Magic is the ability to bend reality, often altering the laws of physics by which the average person deals with life. There are several different varieties, or "Schools" of magic in the World, each with its own defined limitations and laws. While there are relationships between various schools they are generally recognizably distinct. It is based on these different authorities count the varieties, though they come up with anywhere from three to twelve kinds; Lawrence Watt-Evans has stated he counts either five or seven, depending on how he wants to count a couple at any given time. Most sorts of magic do not seem to require a particular inborn talent, though some individuals are more suitable to a particular school than others and some individuals (such as Dumery of Shiphaven) are particularly resistant to magic and thus unsuited to any school.
While some types of magic have their own overarching organizations, such as the Council of Warlocks, or the Sisterhood and Brotherhood of witches, all agree that the most powerful and established is the Wizards' Guild which has allowed it to appoint itself the de facto regulator of interactions between the types of magic.