User blog comment:Xhatefate/DxD Updates~/@comment-1359322-20140919184123/@comment-24502975-20140919212712

There's no way that Rizevim is only a Super Devil because of his SG Canceler, otherwise Sirzechs wouldn't have bothered specifically making a peerage to counter him. Apparently volume 18 is when Rizevim finally gets serious so I'd say in volume 19 we're going to see a serious war from here on out.

I also don't think the 4th arc is anywhere near its end right now. The war between DxD and Qlippoth only started in volume 16, and there's still so much left to cover regarding the plot with 666, it won't end just like that.

So the rest of DxD's back setting will be revealed at a slower pace since there's not that much left, okay. That should leave enough back setting for the remainder of the 4th arc and the 5th arc as well. The Four Gods is going to be interesting, but right now I'm even more interested in the Malebranche because like B said I think Euclid is going to unseal them from the Underworld's prisons as part of their plan all along.