User blog comment:B214/Question and Answers 3/@comment-75.107.224.61-20140711175826/@comment-24502975-20140711180353

Vagueness because it's from volume 18:

The title of a chapter involving Raiser is also a famous line from a burial prayer. Plus, he will be fighting a certain someone who is secretly a part of Qlippoth. Not to mention a new short story is going to focus on him and Ravel, so we assume it's a final farewell before he's killed off.