The realm of Annwyn (“The Bottomless Place”), the Celtic underworld, is known as Niurin to the Manx.
Niurin is a vast plane, where it is always night, and Celtic heroes of old can be encountered carousing and hunting. This realm, which has a faerie aura of 10, also links to Barathrum Land of the Dead) in Arcadia (see Faeries 1st Ed., page 34), and by wandering, visitors might find themselves there. At the center of Niurin is Falga, a vast black fortress — dwelling place of Arawn Midir, along with his consort, Étaín, and the cloan-ny-moyrn (“children of pride”). These Unseelie cloan-ny-moyrn are the fay of Arawn’s court, and there is a wide variety of different types: human-like, animal in appearance, and a mixture of the two. They generally dress in black and silver clothing or armor (or have silver/white or black fur, plumage, or markings), and are usually the hunters or the hunted in Arawn’s Wild Hunt. All the inhabitants of Niurin are at all times solemn and quiet; the sole cause of excitement being the Hunt itself — at which time they become terrifyingly savage and uncontrolled.