I have been reading fiction for five decades. If I every write a story then the grammar, syntax, and usage will be obsessively correct. Beyond that, I make no promises.
Entering ranting mode:
If I read one more story where someone uses 'decimate' to describe the extermination of a group of people, or a scene of widespread death and slaughter, I think I will blow a gasket! The word comes from Latin, where it literally means 'removal of a tenth.' Decimation was a punishment for rebellion or cowardice in the face of the enemy. Individuals or small units showing rebellion or cowardice were executed. Large units, like a legion, were forced to kill one out of every ten selected by lot.
Please, don't use 'decimate' when you mean devastate or exterminate!
Not to mention, that 'prophecy' is a noun: a prediction, while 'prophesy' is a verb: to utter a prophecy.
Oh, and I will leave it up to you to study the difference between 'apocalypse' and 'armageddon!' as well as the difference between 'loose' and 'lose.'
End ranting mode, slightly shamefaced.