The Demonfey are a race of abominations, created by the ritual impregnation of a Dark Elf by a Demon, during the second age. The child this created was able to pass on her demonic/drow heritage, although the original ritual was never recreated. This child went on to become the self proclaimed Empress Sarya Kenafin.
Read More: The Paladin Vlonryn
Il'haress Sarya Kenafin, leader of House Kenafin
Other Notable Demonfey
Xephonis Kenafin Eldest daughter of Sarya, and to date the most affable towards the Tarantula Faction. Xephonis has been responsible for saving some notable members of the faction.
Tarvin Kenafin Killed GEF 1118 during peace talks. Sarya's son, he is a formidable creature, a demon of war as it were. Will fight with fierce determination and loyalty in defence of his family
Demon Lord K'Hafran
Read More: The Life & Times of Lord K'Hafran
The Demonfey's origins begin during the age of the first Drow Empire. House Kenafin, a relatively minor house at the time was striving to be more than they were. They Lacked the royal connections usually needed to do this, and weren't strong enough to force a military rise.
So the minds of House Kenafin formulated a plan. Using research performed by Lyander Al'tath, they summoned a powerful demon known as K'Hafran and using their ritual magic he becomes patron of the household, and father to Sarya Kenafin.
Following the death of her mother, Sarya Kenafin becomes leader of House Kenafin, and takes K'Hafran as her patron. Due to the unique nature of her birth, she is capable of creating children with K'Hafran, and begins creating the Demonfey.
Shortly before the Third Age and as part of the Great Purge, the Paladin Order of Lolth assassinate K'Hafran, we believe this information is still not known by the Demonfey.