http://www.rpgnow.com/product/148906/Tranzars-Redoubt
Here's the cover blurb:
Every fool knows that a cornered conjurer is a most dangerous foe. But a truly wise wizard will always have a fallback plan to use when victory eludes him. A secret place cached with treasure, filled with monsters and guarded by dweomercraft most subtle is the defeated magician’s best friend. It is also a juicy plum for professional adventurers. Care to take a bite?
