Wasn't aware that the aether draining deal was a worldwide thing. Assumed that it only occurred in the place the Calamities took place (which are almost exclusive to Eorzea).
We do know that either a Calamity or Flood will take place (as the voice implied), which leads me to believe that if we don't let a Calamity happen, then a Flood will occur (since there's still an imbalance. The second Mitron was defeated in the First, the Flood occurred. The moment we defeated Lahabrea, Elidibus immediately saw us as a threat to the balance).
Is the history we're going to change going to somehow bring Lahabrea back into the story?