Books of history chronicles. Lost books series

As the land of the Forest Dwellers is increasingly decimated by the Horde, Thomas Hunter, supreme commander of the Forest Guard, choses four sixteen-year-old recruits for a special mission--to find the seven lost Books of History that have power over the past, present, and future.

"Turning his back on all that he once believed, Billos does the forbidden and enters into a Book of History. He lands in a reality as foreign to him as water is to oil--a place called Paradise, Colorado. He has strange new powers given to him courtesy of a mysterious figure known as Marsuvees Black. The chosen four have survived the deseart, escaped the Black Forest, battled the Horde, and added a spirited refugee to their number. But nothing has...

Five years after leaving home, Johnis, Silvie, and Darsal return to find that the Horde has taken over Middle, Thomas and the rest of the Forest Guard have gone into hiding, and a strange new force has begun challenging everything they thought they knew.