The Radiant Realm: Destiny

The first book of the Radiant Realm Series follows Jonny and his companions on a journey to kill a rampaging dragon. After being transported to a weird new realm, Jonny has his work cut out for him. Him and his new companions must now travel through a lot of lands filled with demons and dragons. The three become four when Jonny and his friends meet the Sprite-leader Marus, who happens to be from they're birth-realm. The plot takes an unexpected twist and Jonny's life is changed forever.