[ranchan13]

I do like that they made the point that not a single Dragon Slayer managed to defeat a dragon. Means we still have plenty of good story to go before the series runs in's course.

I can see a couple major arcs
Rogue going rogue (I still see him turning evil)
Lumen Histoire (This was a guild's entire focus, it will come up)
Acnologia (Likely the end arc for the manga)

And there's still plenty of room for other arcs as well