Nabu of Babylon is #1 in the Nephilim hierarchy.
He didn't disappear when Xerxes burned his Father's (Marduk) tomb. He entered into a secret pact with Xerxes and from that point forward he has indwelt some of the most notorious dictators of all time.
They are cowards, but we're approaching the point where this Prince of Darkness will step forward to defend his assumed "Divine Right to Rule."