Nightmare, also known as Nitemare in the Nintendo Entertainment System version, is an enemy in the original Final Fantasy. There is a mandatory Nightmare fight in the Citadel of Trials, but it can also be fought as a random encounter in the Flying Fortress and Chaos Shrine.
They are not very powerful enemies, but can inflict the Blind status through their Snorting attack, although its accuracy is low. Physical attacks are more than enough to defeat them, but if the player wishes to defeat them quickly, then they may use Ice-based attacks such as Blizzara.
Nightmare is a creature from Dungeons & Dragons. The nightmare resembles a large black horse, though flames wreathe its hooves and trail from its nostrils.