Sourcery by Terry Pratchett

Ipslore the Red was the eighth son of an eighth son and a wizard against the Lore of Magic he got married and had eight sons. He has unleashed something that should never have returned to the world a wizard squared, a source of magic, a SOURCERER. Cheating death and Hiding in his sons staff Ipslore guides his sons destiny to wear the Unseen University's Archchancellor's hat and have the wizards of the world bow to him.

As all the bugs and rodents flee the Unseen University ahead of the sourcerer's arrival they are joined by Rincewind the wizards. But Rincewind is unable to escape to the boring life he wants because of the interference of Conina daughter of Cohen the Barbarian under the instructions of the Archchancellor's hat which is determined not to be worn by a sourcerer. Now Rincewind must once again suffer that most terrible of things an adventure. Is the world going to end as the Archchancellor's hat predicts or will Rincewind somehow save the world form the Sourcerer and from the creatures of the Dungeon Dimensions who he has drawn the attention of.

This is a good book (not one of my personal favourite Pratchett books but that is simply because I prefer the Guards books) lots of the great humour that you expect from Pratchett and the antics of Rincewind are always entertaining. Once again though I have noticed reading this book how much Pratchett's writting style has evolved over time.