Ira Rhodes - The Road to War Book Two of the Ira Rhodes Chronicles

Ira and his best friend Julie return to the alternate universe determined to rescue his mother from her evil captor, Armaros. Instead, he finds the world has changed. Armaros has escaped his island prison, and his army ravages the land, destroying all who defy him. To defeat him, and rescue his mother, Ira must raise his own army of mythical creatures - but will it be enough or is it already too late?