What was the half angel and half human called?
Half angels, or even more diluted sons of angels, were called
niphilim. Although they are mentioned in the Bible they are usually
translated as 'giants'-"There were giants on the Earth in those
days". Which for a folklorist would be tantamount to translating
pixies as trolls for instance. Surprisingly enough this more 'holy
race' was actually responsible for the evil that caused Noah's
flood. But quite a lot of this is Babylonian mythology.