Caerulus

Years ago, when ancient man stared up at the heavens and believed it to be the dwelling of gods, something fell. An entity of immense and unfathomable power. From this sole survivor of a war-torn world, three races rose, and for centuries their presence has influenced man. Tales of creatures that defy explanation have been told over fires all over the world. A war, waged in secret, has spanned the ages. A feud between two, kept in the dark by a third. And it is coming to an end. Humanity will fall, for he is no longer the supreme ruler of this planet.

He never has been.

Book 1 - Caerulus
Book 2 - Vermiculus