Sourcery. Discworld Novel 5

'It's vital to remember who you really are . . . it isn't a good idea to rely on other people or things to do it for you, you see. They always get it wrong.'
An eighth son of an eighth son is born, a wizard squared, a source of magic. A sourcerer.
Unseen University, the Discworld's most magical establishment, has finally got its wish: the emergence of a wizard more powerful than ever before. You'd think they would have been a little more careful what they wished for . . .
As the sourcerer tak