SUPREME THRONE

Fiendish Plane

Forgotten Realms

The Supreme Throne was a Fiendish plane in the WORLD TREE cosmology and an Astral dominion in the WORLD AXIS cosmology. Its only standing structure, the Shattered Castle, also known as the Shattered Keep and the Castle of the Supreme Throne, was the divine realm of CYRIC, the Prince of Lies. Following the murder of the Goddess of Magic, MYSTRA, the realm also became CYRIC's prison, by the hands of fellow gods LATHANDER, TYR, and SUNE. According to the GREAT WHEEL cosmology, the Shattered Castle was a realm within Cocytus, the second layer of PANDEMONIUM, after CYRIC retreated from his previous realm of the BONE CASTLE in HADES.
Much like the rest of Cocytus, the Supreme Throne was a barren realm where howling winds could drive mortals mad. Because CYRIC was the enemy of all other faiths, the followers of any deity besides CYRIC found their spells more difficult to cast on the plane. The Shattered Castle was a twisted and ruined fortress that first served as CYRIC's seat of power, and as his prison afterwards. It was called the "Castle of the Supreme Throne" only by CYRIC himself.