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!
but only the former chairman 
knows who those three are.
لكن فقط الرئيس السّابق يعلم من هم أولئك الثلاثة