A renegade wizard had children, thus causing Coin,the last sourcer(this is a pun of sorts, as Coin is the source of Magic), to be born. Coin causes, by his very existence, for new magic to enter the world. This threatens the world, as the wizards, custodians of magic, will get drunk on power and repeat the historical era know as the mage war, which are analagous with nuclear war.
Incompotent and non-magical wizard Rincewind is charged by the hat of the ArchChancellor, a powerful magic relic, to protect the hat from the sourcer, as the university of wizards was created to prevent the problems sourcers create. Meanwhile, Coin enters the university, and, under the direction of his father's ghost, procedes to woo the remaining wizrds with his infinite power.
With the help of his carnivorous Luggage, Coina, the barbarian hairdresser, who cannot escape her barbarian heritage, and a genie, Rincewind must protect the hat from Coin, while simulteaneously staving off the apocalypse.
Eventaully, Rincwind finds himself face to face with Coin. Coin's father demands that the useless resistor be executed, but coin feels pity and hurls the staff binding the ghost to the world away. Coin then procedes to cast the spell perfected by the sourcers of yore, and leave the world to retire to a magic garden,, where his power would not be abused by wizards, and consequently saving the world from itself
This report prepared by snowy
Death has come for Ipslore, the eighth son of an eighth son who left the company of wizards to marry a common woman for love. But Ipslore tricks Death by placing himself in a staff that he gives to HIS eighth son, Coin, a mere slip of a lad destined to become a sourcerer, so that Ipslore can get revenge on his former colleagues and become master of Discworld. Naturally the wizards of Unseen University are too stupid and clumsy to stand up to this threat, but the planet has its unlikely saviors in our old friend Rincewind (widely known as the most inept wizard of all); Conina, a fabulous warrior and daughter of Cohen the Barbarian (though she'd secretly rather be a hairdresser); and young Nijel the Destroyer, a barbarian-wannabe who has been teaching himself to become a great warrior out of a book. The omnivorous, many-legged Luggage that attached itself to Rincewind reappears here (to fall in love and consume a number of mythical beasts that attack it), as does the orangutan Librarian. As is often the case, the set-up and the process of the story are better than the ending, but Pratchett fans will know what they're getting.
This report prepared by David Loftus