The Last of The Nephilim

In the third book in the Oracles of Fire series, the Nephilim, a race of giants from ancient times, manage to invade Second Eden. Two small girls hold keys to the secret that will prevent the disastrous union of Earth and Hades, and must battle the Nephilim with the help of two teenagers while yet another great evil plagues the land. A cataclysmic battle erupts, endangering every life in both worlds. With dragons and giants in bitter conflict, the most powerful of all the Nephilim rises from the dead...but whose side will he be on?