User blog comment:Avatar226/Team Raven Tail/Anti-Fairy Tail Team?/@comment-25485678-20141223115019

bro its called the anti Fairy Tail team coz it was a dark guild created by Ivan (Makarov's son) whose purpose in the GMG arc was to defeat and humiliate Fairy Tail.

It has nothing to do with powers/elements, it's just 2 rival guilds...