Orazulat

Orazulat was a city in Hirokir, on the Zulaca River, which suffered a great cataclysm after the Great Demon Czoloch kept imprisoned beneath the city was released.
For over a century, Orazulat served as a prison for Czoloch, the Eater of Secrets, a demonic amphibious being which emerged from the northern glaciers one summer, and began to plague the Zulaca River. Czoloch could seemingly not be killed, and so instead it was imprisoned at the temple of Orazulat, with constant wards to keep it suppressed.
Internal strife and civil unrest within Orazulat caused the wards to be neglected, and one day Czoloch managed to escape, and summon a horde of lesser demons to destroy the city. It is suspected that Czoloch allowed itself to be captured so that it could be taken to the heart of the city.
Many of the refugees from Orazulat fled to Tyrrus, and found a new life in Erradan.