User blog comment:FairyRaven/Fairy Tail Chapter 327: My Part Too, Review and Commentary/@comment-117.233.104.22-20130412124153/@comment-5170433-20130412140557

From my understanding, Etherion is just like a bomb. It can't be concentrated to one point. So if they did fire Etherion it would destroy Crocus or even might have a larger effect. Plus Etherion is a combination of a whole bunch of different elements which some of the dragons might possess so they might be able to weaken the attack or even nullify it completely.