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Nightmares were evil creatures that appeared to be large black horses with flames wreathing their hooves, flowing forth in the shape of their mane and tail, and trailing from their nostrils and red eyes. If killed, the nightmare's flames guttered out, leaving a mane and tail of ash that quickly dispersed.
Nightmares did not appear naturally. They were the result of a dark magic ritual applied to pegasi. The ritual involved the removal of a pegasus's wings by torture, followed by its transformation and abandonment of its noble qualities in favor of evil.
Nightmares were often conjured into the world to serve as steeds for evil priests and wizards. Sometimes they were sent to a mortal as a "reward" for service to a powerful fiendish lord. A nightmare would sometimes serve a powerful evil creature as a mount. It possessed the ability to travel to other planes and a nightmare could bring its rider to one as well. A nightmare extended its resistance to fire to its rider. According to legend, particularly powerful nightmares could also carry their riders to and from the Shadowfell. There, they served as steeds to powerful evil beings such as hags and demon princes. One should be careful to think a nightmare to be a stupid beast; they were as intelligent as a human, but also wicked and depraved.
- Bruce R. Cordell, Gwendolyn F.M. Kestrel (July 2004). Planar Handbook. (Wizards of the Coast). ISBN 0-7869-3429-8.
- ↑ 1.0 1.1 1.2 1.3 1.4 Allen Varney, ed. (June 1994). Planescape Monstrous Compendium Appendix. (TSR, Inc.), p. 82. ISBN 978-1560768623.
- ↑ 2.0 2.1 2.2 2.3 2.4 Doug Stewart (June 1993). Monstrous Manual. (TSR, Inc), p. 269. ISBN 1-5607-6619-0.
- ↑ 3.0 3.1 3.2 Wizards RPG Team (2014). Monster Manual 5th edition. (Wizards of the Coast), p. 235. ISBN 978-0786965614.
- ↑ Mike Mearls, Stephen Schubert, James Wyatt (June 2008). Monster Manual 4th edition. (Wizards of the Coast), p. 196. ISBN 978-0-7869-4852-9.
- ↑ 5.0 5.1 5.2 5.3 5.4 Skip Williams, Jonathan Tweet, Monte Cook (July 2003). Monster Manual 3.5. (Wizards of the Coast), pp. 194–195. ISBN 0-7869-2893-X.
- ↑ Gary Gygax (December 1977). Monster Manual, 1st edition. (TSR, Inc), p. 74. ISBN 0-9356-9600-8.
- ↑ Warning: edition not specified for Promise of the Witch-King
Achaierai • Barghest • Demodand (Gehreleth) • Hell hound • Larva • Maelephant • Night hag • Nightmare • Rakshasa • Shadow mastiff • Vargouille • Yeth hound
Fey'ri • Fiendish creature • Half-fiend (Alu-fiend • Cambion • Draegloth • Durzagon) • Maeluth • Tanarukk • Tiefling