Every member of the Weir has a weirbook. When a child is born into one of the five guilds, it doesn't matter which of the five, a weirbook is made. A person's weirbook is their personal encyclopedia. It is made by the sorcerer guild at the child's birth. It tells everything about the child. There is a very large section of their geneology that goes back hundreds of years, often to around the twelfth century. For wizards, there is a section entirely dedicated to spells and enchantments.  Each member of the guilds has a certain color to indicate what guild they are.  Wizards would be in gold, warriors in blue, seers in red, enchanters in purple, and sorcerers in green.