Lost Paths pg. 105 describes djinn, a special group of umbrood that must spend time in both the physical world & Umbra. They believe they used to rule humans and resent humans now. Very dishonest & tricky. 945 - 930 BC 10,000 Djinn Plague. Djinn build citadels in the Umbra, each one governed by a Caliph. An Amir advises around 8 Caliphs in an area. All Amirs are ruled by the Sultinate, a sort of family of the oldest djinn that are godlike.
Varieties of Djinn: Sharateen, Efrit, Aamar, Rajim
Evil djinn tend to be associated with fire & earth. Benevolent djinn are usually associated with air & water.
When djinn in human form have children with humans, jann result.
City of Brass is greatest djinn citadel.
pg. 131 Gods & Monsters describes the Djinn for Mage20
pg. 182 Dark Ages Mage covers djinn & City of Brass briefly. +3 difficulty to social rolls for those not knowledgable of djinn. +1 for those who are.