Apocalypse

An apocalypse (Ancient Greek: ἀποκάλυψις apokálypsis, from of/from: ἀπό and cover: κάλυψις, literally meaning “from cover”) is a disclosure or revelation of great knowledge. (via Wikipedia)

escatology

A part of theology concerned with the end of times (via Wikipedia).

end of times

The final events of history, the ultimate destiny of humanity.