The Sluagh (sloo-ah), are considered to be a manifestation of the Wild Hunt. They consist of the the monsters and frights from the dark considered by many to be troublesome and destructive. The word Sluagh refers to a "host," or another translation would be "army."
The Sluagh often travel by flying through the air at night and in the past have been known to kidnap mortals with them on their journeys. The Sluagh are considered to be the most fierce and terrifying of all the fairy peoples. The Hosts to travel at night and more particularly around the time of midnight, many in fact, including the nightflyers, are badly affected by sunlight.
The Wild Hunt rides forth accompanied by a flock of copper red birds who ruin crops and kill animals using their poisonous breath. The so-called hell hounds are said to accompany them.  The sluagh are believed to have been the original Unseelie Court
Like most of the courts, humans live among the sluagh including a doctor, Henry, and a seamstress, Mirabella, who had once been recruited by the Seelie, but when she fought off a sexual assualt by Taranis, he cut off her arm and banished her. Accepted by the Sluagh, her lost arm was replaced with a Nightflyer tentacle by Henry.