Beyond the Wall

The Formorians, led by the gigantic Queens, have breached humanity's last line of defense!
Elaine, now Sentinel Dawn, and the rest of the Sentinels need to rush to the front lines, to attempt to stabilize the situation, and bring the 2500-year long war against the Formorians to a grand finale.
And yet, beyond them lurks an even greater danger.
What could've possibly driven the Formorian Queens and Royal Guards out of their lairs, into human territory?
Will Elaine and the Sentinels have to pay a terrible price to save humanity?
Or will civilization be smashed, and humans scattered to the winds?
And what, exactly, are the Dragoneye Moons?