Giants — Vaughn Heppner

The Nephilim -- the sons of fallen angels -- have a plan: find ancient, powerful weapons, storm Eden, defeat the guardian Cherub with his flaming sword and eat from the Tree of Life. Then they can rule the Earth as gods.

Gaining such weapons is highly dangerous, however. They will need ensorcelled humans to trip primeval traps for them, dying in their place.

Young Joash, a freed slave, knows nothing about these things. He trains to become a charioteer like the champion Herrek who freed him from bondage. But when Herrek's band falls under a Nephilim spell, Joash will have to find the courage and wisdom to be like the mouse that freed a netted lion and save his newfound family and friends from a hideous and ancient evil.

GIANTS is the start of the Lost Civilizations Series that tells of the war between Nephilim and men in the days before the oceans overran the Pre-Cataclysmic World.