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Spectrier is an equine Pokémon with black fur and a purple marking covering the right side of its face extending to the back of its ears. Its left eye is closed with thick, mauve-colored eyelashes. Its purple mane is wavy, with the tips of its mane transitioning to mauve, while a fringe and its tail are completely mauve. It has slender legs marked with a purple sock pattern. Each of its purple hooves is detached from its legs at the pastern, and the rear pair of hooves are trailed by spectral mist.
As Spectrier desires isolation and silence, it tends to be active during the night where its energy is heightened. Its nocturnal habits resulted in it having weak eyesight, but its other four senses are keenly sharpened; this allows Spectrier to have an accurate sense of the terrain and location of living things. Its kicks are said to separate a soul from its body, and it can steal the life force of sleeping beings. It feeds on the ambient life-force it steals from others and will attack anyone who would try to disturb it.
Spectrier is known to be very proud and arrogant, preferring to serve individuals it deems the strongest. It once ruled over the Crown Tundra as the lord of all Pokémon. Spectrier was known to terrorize the Crown Tundra for a time due to humans invading its territory; this lasted until it was defeated and tamed by Calyrex. It has a fondness for carrots, particularly Shaderoot Carrots.
This Pokémon was unavailable prior to Generation VIII.
Spectrier and Glastrier are the only Pokémon introduced in the Crown Tundra that were not directly revealed to the public.
Spectrier may draw inspiration from the mythological Four Horsemen of the Apocalypse, Spectrier representing the black horse of Famine given its roaming nature and purported ability to absorb life-force from living creatures, or the ashen horse of death, given its ghost typing and draining of life. It may also be based on the black-colored knight chess piece.
Both Spectrier and its counterpart Glastrier's relationship with Calyrex appears to be based on the legend of Brian Boru and the Pooka. Legend has it that Brian Boru, the High King of Ireland, is the only person to have ever ridden a Pooka, a mischievous faery in the form of a black horse. Brian tamed the Pooka by using a special bridle that contained three hairs from the Pooka's tail and successfully staying on its back through a wild ride. The king then forced the Pooka not to torment Christian people and to never attack an Irishman ever again. This is similar to how Calyrex, a Pokémon known as a king, can only ride its loyal steed, Glastrier or Spectrier, using the Reins of Unity woven in part from hairs from the steed's mane and had to prove itself by riding through the steed's bucking. It also relates to how, in taming this steed, Calyrex stopped the steed Pokémon from tormenting the people of the Crown Tundra. Spectrier in particular may take direct inspiration from the Pooka, being a black horse that mostly appears at night.
Alternatively, Spectrier may be based on Llamrei, a mare owned by King Arthur in the Welsh tale Culhwch and Olwen. According to local legends of Snowdonia, Llamrei expelled the lake monster of Llyn Barforg (Bearded Lake) and left her footprint on a stone by the lake. Therefore, its ability to prey on the life energy of sleeping creatures may be a wordplay on 'mare', as both a sleep demon and a female horse, though with different etymology, are spelt as 'mare' in modern English. Spectrier and Glastrier may also be based on Liath Macha and Dub Sainglend, two chariot horses of the hero Cúchulainn of Irish Mythology.
Spectrier together with Glastrier may also be based on the Horsehead Nebula, a horse-shaped nebula near the constellation Orion. This would correspond to Calyrex's possibly representing Orion itself, specifically Rigel, its brightest star.
Spectrier may be a combination of spectre and destrier, a type of medieval war horse.
Wraithpos may be a combination of wraith, 霊 rei (spirit), and ἵππος híppos (Greek for horse) or horse.