|“||The Riders of Mannan have done the bidding of the Unseelie King for a thousand years. In that time many have fallen to our blades, and we have spared none for any reason, not for age or weakness or infirmity of body. We will not spare you now.||”|
|“||We seek. And we find. We are the searchers. We have been under the waves to search and above them. We have been in Faerie, and in the realms of the damned, and on battlefields and in the dark of night and the bright of day. In all our lives there has only been one thing we have sought and not found.||”|
The Riders of Mannan are a very old group of faeries who claim to be the children of the god Mannan. They are a powerful, vicious, and ferocious pack who serve the King of the Unseelie Court as his assassins and searchers. The Riders usually sleep beneath a hill until they are wakened, usually at times of war.
The Riders are ruthless with their targets. The Riders are often tasked to kill a target, or find an object or person, during which they would not hesitate to kill anyone who gets in their way, or anyone who could help them achieve their goal. They are expert hunters, their skills on par with, if not greater than, the Wild Hunt's.
The Riders were initially made up of seven members: Karn, Etarlam, Eochaid, Delan, Airmed, Fal, and Ethna—Ethna being the only female member of the group. The Riders are siblings, or at least consider themselves as such, and are fiercely loyal to one another. They ride steeds that coalesce from the air, and the angelic weapons of the Nephilim are ineffective against them. Also despite being faeries, they are wild magic and can lie. They are much taller and larger than other faeries and are all have bronze skin and hair, donning half masks of gleaming metal. Each is armed with a massive longsword, among other weapons.
The Riders have apparently been alive since the beginning of time. There was a time in the old days when the Riders had hunted giants and monsters.
In 2012, the Riders were sent by the King to retrieve the Black Volume of the Dead. Because the King suspected that the Blackthorn family had the book or knew where it was, the Riders followed that lead and went after them. Because some were protected in the London Institute, they split up into two groups and went after two sets of Blackthorns who had been out and about in England: Karn, Etarlam, and Eochaid went after Ty and Livia Blackthorn and Kit Herondale in London, while Delan, Ethna, Airmed, and Fal went after Emma Carstairs and Julian Blackthorn in Cornwall.
In London, Eochaid thought that Kit's face was familiar but still intended to kill him; the Riders pursuing him and the twins were intercepted by Gwyn ap Nudd and Diana Wrayburn, however, and were forced to leave. Meanwhile in Cornwall, the Riders fought Emma and Julian until Emma killed Fal with her sword Cortana. This shocked the Riders, as no one had ever been able to kill any of them, making Emma the first to kill a Rider.
All six remaining Riders later went to the London Institute, using a human child to lure them out. Emma was the first to come out and confront them, and the others followed shortly after. When they were just about to overpower them, Annabel Blackthorn and Magnus Bane arrived and drove them away. Annabel made them leave with a threat to the King, telling them that she knew his name—potentially granting her power over him.
- The Riders are often mistaken for the Wild Hunt because of their flying horses.
- Seraph blades explode when they come in contact with the Riders.