The Tale of the Voice of Thunder by Aaron T. Woodhouse

Epikus, the crown prince of the Kingdom of Zen, must choose a path to become king. After years of peace, his father's old nemesis Otar rises once again to take his kingdom and crown. Epikus grows in his power, from the Voice of Thunder to the Warrior's Boon, and learns the strength it will take to lead in this epic tale of conquest and vengeance! Will Epikus be able to defeat the dreaded evil threat?