Liber Mutatis: The Book of Change

Magic pervades the Old World, coursing through the Eight Winds. Humans that learn to harness the energy found in the Winds of Magic can become powerful wizards. Or they may succumb to Tzeentch, the Changer of Ways, tempted by his offer of power, knowledge, and mastery of the dark arts.
For the GM, Liber Mutatis introduces the Ruinous Power Tzeentch, his daemonic minions, and insights into the Great Conspirator’s fiendish schemes. New rules for corruption and mutation expose the characters to greater risks over the course of their adventures. Finally, Liber Mutatis includes a complete adventure for GMs to challenge their players with a dangerous plot unfolding in the heart of the Empire.