User blog comment:GregoriusThe2nd/SEASON 10 RENEWAL/@comment-5619706-20140214030528/@comment-11787399-20140214051627

Yeah, back when first took over in S8 he said he plotted out a whole story that would reach him to the end of S10

I'm guessing the whole thing will be brought to the forefront towards the end of this season. When you think about it, the tablets leading to the fall of the angels is kind of similar to those seals leading to lucifer being released.