Daniel Locke and the Fortress of Valhalla by Marty Longson
Series: Black Dragon, Book 2.
Approx. 57,820 words.
Published on March 1, 2012.
Six ancient towers stand guard over the earth, protecting it from every conceivable demise... most of the time. The Fortress of Valhalla, designed to house the best army of warriors the earth has ever known. But what happens when control of the fortress falls into the hands of a tyrant with dreams of world dominance?