Pale Rider

Pale Riders (ペイルライダー) are high-level undead summoned by Ainz Ooal Gown.

Appearance
Pale Riders resemble horsemen, the kind that exudes an ominous aura and rides upon pale horses.

Abilities
Pale Riders can ride into the air and turn immaterial, allowing them to pass through obstacles in their terrain environment.

Trivia

 * Ainz Ooal Gown summoned several Pale Riders to act as perimeter guards when setting out to negotiate with the Serpent of the West and Giant of the East.
 * These undead do not appear in the Anime.