[Riku can only shrug at the question – even after all these months in this world he has only little idea about who the Natha truly are beyond their involvement with their rescue, and their apparent fight(?) against the Storm. So really, all he can do is confirm Roxas' suspicions.]

I don't know; none of us do. The Natha so far haven't really deigned to share anything about themselves, their powers or the Storm.

[Which is really one of the things that makes Riku wonder… given the nature of the Storm, wouldn't it be better to share their information with the refugees, so they can combat the Storm together?]