User blog comment:Relikz/Chaotic Rumors/@comment-1454981-20111012174142/@comment-78.251.107.38-20111013231204

It does seem to be the name of the third spell, maybe it's some kind of bubble created by the mysterious girl (a fairy or Mavis) to protect Tenrou Island and hide it from people outside the island, that would explain why they couldn't find any survivors...