The Diamond Fortress

The Diamond Fortress is a vast structure that resembles a titanic diamond, embedded in the earth, pulsating with evil power and inhabited by horrid crystalline demons intent on destroying the Material Plane and transforming the world into lifeless crystal. Only the PCs can stop the fortress' masters before they unleash their terrible crystalline army and bring doom to the land.

A Third Edition adventure for four to six characters of 11th-13th level