Board Thread:Lore Discussion/@comment-31567698-20170321093852/@comment-1975828-20170321152314

From what I can gather, the Age of Deep Sea is an age that could exist once the flame fades, by removing humanity from the world, a major component in Kaathe's Dark Age.

If you take a closer look, the Evangelists who serve Aldrich are carrying a weapon on their belts that is used for bloodletting. Presumably, the bloodletting is a ritual used to remove humanity from humans.

The Pus of Man, which originates from humanity, can only be found in places where there are no Evangelists. The Irithyllian slaves barely have a form, and they are said to slurp on blood gems, presumably because they lost a lot of blood, from bloodlettng.

This is just what I think though, I could be wrong.