The Daevites, also known as the Daevas or the Daeva, are a culture in the SCP Foundation universe. They originated from SCP-140, a book that expands upon the history of the civilization if blood or ink is in its presence.
The Daevites were a matriarchal culture centered in modern Mongolia, which at various points through history had an empire that extended as far as Europe and the Middle East. All periods of the civilization had militarism, conquest, cities ruling over large slave populations, human sacrifice, ancestor worship, and functioning magic as core aspects, though they still otherwise changed over time. The Daevas were longer lived than humans, and were divergent from modern humans enough to be considered a separate subspecies. The culture created a variety of objects that would qualify for SCP classification if rediscovered today.
Deva Warriors in Chronicles of Great New Empire.