The Cu Sidhe claim descent from the Hounds of Arawn. The largest of their clans range around the crags and rocks of the highlands among the countries of: Gaidhealtachd, Meadhan, and Iosal. The rest are scattered in density from northern Albion down to the south of Jorvik. With them being seen rarer and rarer any farther south.

One of the many branches off of the Cynocephalus family their branch can be seen by their various horn types coupled with upper arm and chest fluff. Their tails are curved, and sometimes braided the older they get as their tails grow.