User blog comment:B214/Question and Answers 6/@comment-24098614-20170305110645/@comment-29963364-20170305233444

I do have a theory on that.

When Ophis blessed Vali, he achieved his [DxD - L] mode, which is a fusion of Vali's "Lucifer Power" and Albion's "Full Power."

In this form, Vali releases a "brilliant light," and everything within this "light" is divided out of existance, just like his [Compression Divider].

If we take this, and add the fact that "Lucifer" means "Light-Bringer", or "Morning Star", then I think that the unique ability of the Lucifer blood-line is "Demonic Light." It's a perfect counter to the Biblical God's "Holy Light."

But since it wasn't mentioned, or even hinted at in the series, this is just speculation. But I do think it's a good theory.