Memory:Vapor rat

When walking in fogs or mists, many people hear odd skittering noises that they attribute to strange echoes in the mist; they are really the sounds of giant rats who have bred in the fogs for so long, they have taken part of it into themselves and now have a hazy, misshapen border at their edges that makes them difficult to strike since opponents aren't really sure where the rat ends and the mists begin. A thin pale rodent surrounded by a strange mist. The shape constantly fades into the mist, then again becomes more distinct, absorbing the vapours, then once again seems to dissolve. A proper rat shouldn't behave like that, so there's probably something wrong with it.