On American versions of Final Fantasy: Mystic Quest, there is a particular glitch regarding the Life spell. Like in most Final Fantasies (and the EU/JP versions of this game), it is intended to be able to do extreme damage to undead enemies. However, a few flags got mixed up in the US versions of the game: in this version, you can use Life to kill non-undead enemies, although you can't damage undead enemies at all with this spell.