Specktral

Specktral - mount.

Official description
Specktrals are phantasmal steeds that roam both the Nether world and the living. It is believed that they have the ability to pass from one realm to the other, which is how some of them have come to inhabit Aurora. A popular theory is that a person riding a Nether Charger can also pass through to the other realm, although there are no known successful attempts.

Exterior
Specktral - horse with a bluish mane and tail and a blue haze around the upper parts of the hooves.