Nightmare (creature)

A nightmare is a neutral evil outsider that resembles a large black horse with flames wreathing its hooves and trailing from its nostrils. A nightmare will sometimes serve powerful evil creature as a mount. While possessing the ability to travel to other planes, a nightmare can bring its rider therewith.

Nightmares can also be summoned using a figurine of wondrous power. This magical item brings forth a nightmare or any other extra-planar creature it was enchanted for, for a period of time in which you have control over the creature for the duration of its indenture. After which the creature returns to its home plane to rest until you can call it again.