>>I think Meiling, given her repeated claims of dragonhood, is just as
>>likely to either bend fire, or bend water as an extension of her frost
>>breath weapon. (What would a breath weapon associated with earth look
>>like, anyway?)
>
>Probably some sort of sandstorm, Pokémon style. (In D&D,
>they'd likely go for a petrification ray.)

Acid is another choice, part way through the 3.x era there was a linking of energy types to elements:

Fire - Fire
Water - Cold
Air - Lightning
Earth - Acid