I'm not really sure. It's some -- immensely powerful creature that comes from beyond our world, and it feeds off aer, which the blastia use to operate. The increased usage of blastia caught its attention, and it could have turned consumed all life on the planet. It was -- vast. Stretching across the entire sky. [a little quiet from the memories. those tendrils, discoloring the entire world, everything, everywhere...]
But someone came up with a way to reduce our dependency on aer and destroy the blastia for good. And Judith was one of the people who enacted that plan and ended the threat.