User blog comment:Miskos3/Fairy Tail 511: The Hell of Starvation, Review/@comment-1359322-20161119142633/@comment-4829046-20161119173729

Yeah what FTF said. He cannot seem to activate them all at once without some kinda of drawback. The one related to sleep seems to be the most useful in taking out the opponents but maybe it is too dangerous for large scale or because it is designed for a single opponent i.e. Acnologia, he needs to have a clear target.