Truthseeker — James Buehler

Long ago, five nearly indestructible swords were created by the mysterious B'ajj. The first of these swords, Truthseeker, falls into the hands of Bart Taylor, an ordinary teen with ordinary ambitions. After inadvertently saving the beautiful Erin McNamara from her would-be kidnappers and vowing to protect her, Bart is drawn into a conflict on another world that could bring a vicious overlord's wrath down on Earth. In the face of a colossal battle, the magical sword could be the key to the safekeeping not only of Erin, but of an entire solar system.