Before 1914?
Running Greece where his throne was. Then maybe hopping on the Roman bandwagon. Making certain no one could find those Library of Alexandria scrolls. Smirking at how the poor and enslaved were left to die in the Vesuvius eruption.
Moving on to European wars skirmishes and crusades. Ensuring the Chinese invented gunpowder and SE Asians stopped eating beef. Popped over to the Americas where there were people to yet be slaughtered and sneezed on. (No one gets to hang in the cut, so to speak.) The whole slavery thing. Later his crew hung out with the adventist movement giving them false dates while giggling.
At some point there's a bunch of those bad boys chained and imprisoned.
As for angelic DNA and whatnot, who says that went out with the flood? We don't know the ancestry of Noah's wife nor his sons' wives.
Genesis 6:4 NET
The Nephilim were on the earth in those days (and also after this) when the sons of God were having sexual relations with the daughters of humankind, who gave birth to their children. They were the mighty heroes of old, the famous men.
Numbers 13:33 NET
We even saw the Nephilim there (the descendants of Anak came from the Nephilim), and we seemed like grasshoppers both to ourselves and to them."