apocalypse

nouns

a cosmic cataclysm in which God destroys the ruling powers of evil
apocalypse
is derived from
apocalyptic
is derived from
apocalyptical
is a type of (narrower)
an event resulting in great loss and misfortune
"the whole city was affected by the irremediable calamity"; "the earthquake was a disaster"
calamity, cataclysm, catastrophe, disaster, tragedy