Back on July 10th, episode 241 of Fairy Tail came out and in part of zcezs's summary, he said this:
And time for Erza to get revenge, still when Kyouka found out how Natsu and Lisanna got out, why she didn't think that perhaps Silver might a traitor, we don't know if he is a traitor or not, but still if I was her that evidence would make me think that at least. Anyway Erza is going to do something she never got a chance to do back in the Tower of Heaven when she was a kid, get some payback.
My question: how? How is Erza going to get her "revenge"? And how is it mean to qualify as such?