Pale Rider

Pale Riders are high level undead summoned by Ainz Ooal Gown.

Appearance
They resemble horsemen with an ominous auras, and ride 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 to act as perimeter guards, when setting out to negotiate with the Serpent of the West and Giant of the East.