eschatology (n.)

1834, from Latinized form of Greek eskhatos "last, furthest, uttermost, extreme, most remote" in time, space, degree (from PIE *eghs-ko-, suffixed form of *eghs "out;" see ex-) + -ology. In theology, the study of the four last things (death, judgment, heaven, hell). Related: Eschatological; eschatologically.