User blog comment:Red Eyed Raven/just a quick thought/@comment-4938779-20131214004022

Maybe Tartorus knew how horrible is the magic council headquarters defenses are and just decide to attack <_<

Regarding the dragon and zeref relationship. I think there is no relationship besides Aconolgia this case. Maybe Tartorus was like sleeping and they were storing power and maybe thats why Silver made the mistake for a demon for a dragon. I also recall that Future Rouge mention that Frosch was going to die a year and that made Rouge go to the "dark side" but i think Frosch death may have to with Tartorus or the future war against Tartorus and Zeref