The council getting wiped out by Jackal.
Juvia and her Gray-Bread antics.
Cobra trying to bargain for the Oracion Seis' release with Doranbalt.
Every member or Tartaros is a demon (even the devil slayer).
The big bad E.N.D. that Igneel couldn't stop is the leader of Tartaros
What Cobra said can be wrong regarding Silver or not even 100% correct. Did you think the Balam alliance would reveal all of their secrets to each other? I think that as far as Cobra knows, Silver is a demon from the book of Zeref. But what if the truth is somewhat different? he could still be a human that was turned into a demon with the Book of Zeref.
If Mashima wanted to, he could've drawn Silver in his demon form (or a demon, entirely) during his introduction. But he didn't. Why? Mashima is clearly hinting something here.
After this chapter I believe that Jackal will be the guardian of the sixth circle.
I hope that He will fight Natsu that will be helped from Lucy, Yukino, Flare (if She will be part of the alliance). I hope that even Angel will came to help them, counting that she is the sister of Yukino.
I believe that the one that said that Jackal and Tempesta are on a mission is the one that stand up for Gluttony, at least to me He even resemble Gluttony of Full Metal Alchemist.
She could create the hail, but I would prefer if He can eat the magic of his enemies, in this way she could be defeated from Lluvia and Gray unison raid (perhaps even Eve with his snow), with even the help of Ichiya, infact He could make nauseating the hail that Gray and Lluvia will do (if Gray will freeze Lluvia's water).
I believe that the demon that his dress looks like a chessboard stand up for the first circle, the Limbo. I believe infact that he looks like a bat, He has also two protruding teeth.
I believe that he can tranform in a bat, I think that he can use the Darkness Magic, just like Shimon, then I believe that He will screams and then He will create a sound wave that will affect his opponents.
I believe that at the beginning He will fight several members of the alliance, almost all the alliance, then I believe that He will fight and then be defeated from Sting and Rogue, with perhaps He will be helped from Fried (with his rune He could overrule the effects of the sound wave, in a similar way to what did Levy here http://www.mangareader.net/135-58636...apter-211.html), Bixlow and then perhaps even Rufus.