User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-1359322-20141119194655/@comment-24552694-20141119213331

Remeber everyone, that  our great Author-sama said that he is planning a happy ending for all of the girls in the group. so there is no way that Ravel is going to Die, Alright :)

Though Riser... i don't now. though remeber, the Author appears to favour  a happy ending for main heroes. though this makes me wonder, rember the Rook Isabel of Riser's group, she appears to be intersted or atlest rerspectful of issei, she also wears a mask for some reaso, so maybe this story does end in Riser's death and Isabella goes over to Issei with Ravel.

Though the caneling out the immortality, that eems like too specfifc of a power for the Emporeor, who will most likely become a major atangonist of the next arc, or this one. mayb it it a Household trait canceller (e.g. Power of destruction, immortality, etc)