Ever head of the Nephilim? In short - they were the offspring of Fallen Angels and human females. They taught man many things they weren't supposed to know. They took over mankind and when man was of no further use to them, the nephilim turned on man and feasted on their flesh and drank their blood.
Sound Familiar....?
Subsequently the great flood occured when God wiped the planet, saving only a worthy few. Did any survive? Word is that they were that tall that some may have.
The book of Enoch covers this. Here is another great discussion on the topic:
https://youtu.be/1zz8_MxcnzY
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