MARK OF THE BEAST Revealed: People from on mountain went down and saw son's of ??? naked and unashamed which story is this?

trying to find the story I read about possibly biblical, where the son's of somebody went down from a mountain and saw the daughters of somebody and they were naked and unashamed and the ones from the mountains that came down had sex with those from the valley and were unable to return to the mountain.

I believe it is in regards to the mark of the beast which is having sex with beasts, or those that look human but are not. Like the lemurians supposedly did. I believe the mark of the beast is having sex with the khazars or serpent people/jews.

If you watch the Katy Perry video dark horse, it is obvious the illuminati wanted the nobody to have sex with her and the video states she is a beast, and "once your mine, there's no going back"

Any help would be appreciated.
-Autodidactic