Eschatological: Of or relating to-
Eschatology: The part of theology concerned with death, judgment, and the final destiny of the soul and of humankind.
Dealing with the end; having to do with doomsday shit
“He was consumed by eschatological reveries; dreams of doom.” a person who whips themselves to repent for sins (flagellation). They would likely be someone who is consumed by an eschatological ideology.
An obsession with the eschatological angle of christianity, would be an obsession with the coming of the end.
1: a branch of theology concerned with the final events in the history of the world or of humankind