Quote Originally Posted by Peter_18
Yeah, but what does the amnesia thing really imply?
It implies what one would probably assume--that something (in this case, spells) can't be remembered. If Fog is used successfully against the party, afflicted characters will be unable to use magic, and this effect will last even after the battle ends. Regarding use against enemies, the functionality is almost identical to Mute, as the enemies won't actually survive beyond the battle anyway.