"Nethys's doctrines as a mortal are obscured in hazes of history. It is said that Nethys destroyed Ulunat, First Spawn of Rovagug, or granted the first Pharaoh of Osirion the power to destroy it, before he was a god. It is said that he thought little of all who were not wizards."
"As a god, little is known of His doctrines because anyone that Nethys touches goes mad. His Heralds, who on rare occasions have been known to send visions, seem to each have different concepts of what is Nethys's doctrine. In practice, the doctrines of the Church of Nethys are whatever the current most powerful caster in Nethys's service says are the doctrines. Currently that is Nefreti Clepati, who, much like Nethys, is widely believed to be both omniscient and mad. She is also reputed to be incredibly, incredibly annoying."
"Nethys's domains are knowledge, magic, destruction, and madness."