Shadow of the Crimson Moon: Atlantis Falls - Book 3: in Bloomington, MN

In this prequel/ trilogy climax, the utopian city of Atlantis has enjoyed decades of prosperity and peace as a shining beacon in the Mesopotamian Valley. But when the first crimson Moon appears, the Atlantean Empire sees this as a foreboding sign. Meanwhile, the city suffers a major defeat in a battle to the Athenians and their horde of Nephilim soldiers.
Ethereal spirit beings worshipped by the Atlanteans, called Legion, warn of a coming judgment – a devastating flood that will sink Atlantis. King Aza is given a way to save his city's inhabitants, but the cost will be high.
A prominent scientist, Dovan Arilian, senses more is happening than meets the eye. A sinister plan is soon uncovered that will shake humanity's core and the future legacy of Atlantis.