Nibiru's Awakening: Book I of the Nibiru Saga

Matthew Curtis finds himself on a distant planet, Nibiru, where he is the Chosen One and must stop a malevolent king from conquering Nibiru, battle an evil goddess who is bent on enslaving all of the Nibiruins, as well as preventing an ancient dragon from waking up or else it´ll destroy Nibiru. Matt´s only hope lies in finding six elemental crystals that are scattered across Earth. He will need the help from all his friends and even that of a talking horse. Oh, and he only has until high school starts in the fall to do so.