I doubt that the Nephilim were a fabrication because in the Old Testament there was a great flood that some say engulfed the world killing everyone and everything except the people in Noah's ark. With the Nephilim came corruption and murder (according to the Book of Enoch)
I dont believe that the apocalypse will be the wrath of god. I believe that there are many different factors like demons and fallen angels and Lucifer. Not to mention man's greed and pride and Envy thrown into the mix.
In the bible and in the book of Enoch, the name Nephilim is mentioned. Some say the name Nephilim is Hebrew for Fallen Ones. Others say, they are offspring of the Grigori who mated with mortal women.
I am interested in your thoughts on what exactly the Nephilim are.