In Zetsuen No Tempest, there was this sickness that turned everything into black iron, which is where its name came from. However, from what I can remember, I am sure there was no explanation in the anime to this question.

Why are butterflies not affected by the Black Iron Sickness?

Was this ever revealed in the manga? I am positive that it is not mentioned in the anime series, or on Zetsuen No Tempest Wiki, but was there ever an explanation for this? And if this was in the anime, would you please include a reference to the episode?

Answers are appreciated. :)

  • Maybe because of the same reason magicians are not: because butterflies are surrounded by a magic field. – user22424 Mar 2 '16 at 18:37

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