Fiendish planes

Fiendish planes was a collective term used to describe a subset of the Outer Planes in the World Tree cosmology model. The fiendish planes were generally associated with the evil deities whereas the celestial planes were generally associated with the good ones. The fiendish planes were: The River of Blood connected all of these planes except for the Demonweb Pits and the Supreme Throne. Navigating the river between planes was possible but very dangerous.
 * The Abyss
 * The Barrens of Doom and Despair
 * Blood Rift
 * Clangor
 * Deep Caverns
 * The Demonweb Pits
 * Fated Depths
 * Fury's Heart
 * Hammergrim
 * The Nine Hells
 * Nishrek
 * The Supreme Throne