In the Creation War, the efreet served the primordials as tacticians, advisors, generals, and in other positions of influence and prestige. Since efreet are most commonly neutral in alignment (following their creator Kossuth), those that fought in the Creation War often found themselves in positions where their morality would be tested - especially when serving under the more wicked primordials. Those that lacked the will to stay the path became a sub-type of efreet called the Furrouth. The Furrouth became chaotic evil. After the Creation War, they were rounded up and put to work on the Endless Wall. Over decades, emanations of Law from this wall changed their morality from chaotic to lawful. Once they had become lawful, they were released from imprisonment. Many of these lawful evil efreet worship Surtur.
When Set created the Corralum, he employed the Furrouth to teach them industry. They also served as overseers and enforcers, keeping the growing population of the Khazarkars in check. In the Maenedhel Shattering, the Khazarkars and the Furrouth were driven from Maenedhel. In the confusion, the Furrouth were attacked by those bent on avenging past wrongs. When the Furrouth learned that it was Set's priests instigating these attacks, they decided it was best to go their separate ways. They went west and down into the Underdark instead of up to the surface with the Khazarkars. Most of the Furrouth living in Goth-Dyvermoir and across Karterus are descendants of those that once lived in Maenedhel.