The Ghast, also known as the GEIST in the Nintendo Entertainment System version, is an enemy in the original Final Fantasy. Its attacks may cause Paralysis to party members that it hits, so it is advised to attack all Ghasts physically before a powerful member is paralyzed. As an undead enemy, it is susceptible to Fire-elemental attacks and Dia spells.
It commonly appears near the towns of Melmond and Elfheim and inside the Cavern of Earth and the Cavern of Ice; in their later appearances, they are famous for being dangerous (and frustrating) due to their tendency to attack in large, chain-paralyzing packs.
Geist is a German word. Depending on context it can be translated as the English words mind, spirit, or ghost, covering the semantic field of these three English nouns.