Amethyst Factions, which may be out for both 4E and Pathfinder. It is still in development as we await returns from the two upcoming books. It will include everything you need to know about Nihilimancy.
â€œI despise stallions. I ride them as I ride an ugly noble women--smiles for appearances and politics only. Stallions. All personality with no depth. They prance like ponies and trot with arrogance. I always say, respect your mules most of all. A stallion may lead with the king and gather the eyes, but a mule will follow behindâ€¦and carry your kingdom.â€