Fiendish planes is a collective term for the evil-aligned planes of existence in the World Tree cosmology.
“The Supreme Throne is the realm in which Cyric, the Prince of Lies, holds dominion. After the...Supreme Throne
“Blood Rift Basic information Traits The Blood Rift was named for the rift that the River of...Blood Rift
“Nishrek was a fiendish plane in the World Tree cosmology model and later an astral dominion in...Nishrek
“Fury's Heart was a Fiendish plane in the World Tree cosmology model. It was the home plane of...Fury's Heart