User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1884090-20140204160946/@comment-3965848-20140205165547

I know Rizevim is crazy but I don't think he's dumb enough to not have Lilith by his side, she is a spawn of Ophis right, so would that mean that Lilith is also a Dragon, meaning the best way to take her out is to use Dragon Slaying Magic like Ascalon or Gram.

Or maybe Issei can convice her to leave Rizevim, at least thats what I think.