[quote=Kalamadea]
It uses fire and air, which means heat in most cases, so it would be useless against metroids. The lore very, very specifically states that cold is a pure metroid's one and only weakness, with no exceptions. Using the One Power to freeze, however, would suffice, though if that Omega is after you, you'd have to use a lot of cold in a very localized area to defeat it, because an Omega Metroid is only vulnerable on the exposed membrane on the abdominal area. Every other part of its body is impervious to all attacks, including cold.I think you can see why there's only one of them right now, lol, and only fifteen metroids total.
[/quote]

It uses the Fire and Air weaves, to remove something from existence. It doesn't matter what your resistant to. It doesn't matter if you can only be killed by a silver spoon with a carving of Woody and Buzz shaking hands on it. Balefire ignores that and just, pop. Gone.