Erza and Mirajane visit Crawford, the former Magic Council chairman, and fall into Tartaros's trap. And in exchange for information on Tartaros, Doranbolt frees all the members of Oracion Seis!
Then how did they get information 
that even you don't have?
إذًا كيف حصلوا على معلومةٍ حتّى أنت لا تملكها؟