The High Magistrate Invokes the Typhen

Celestial

To seal the Mind-Plague, and cause all to forget... because they must, the High Magistrate willingly invokes that which will destroy them. They call down the devilish evil that wished to destroy them for millennia, and through deals, the destroy must also act as guardian... and guard the ruins from any intruders that might spread the mind-plague. In this, the world is saved from utter destruction.

The High Magistrate of Erinion invokes the Typhen, as many of his allies succumb to the Mind-Plague and their civilization is erased, calling it into coterminance with the power he has learned from all this, and striking a deal. The Typhen destroys Erinion and in return they guard it from intruders. The High Magistrate uses extremely powerful Community and Thought magics, manipulating the last living Quori trapped upon Sartova to channel these psionics, and wipes all memory of Erinion and it's people from the minds of those alive, effectively curing those still alive.