Phandagron Chronicles: The Ninja and the Paladancer

Tea Cha is a ninja. Delta Omi is a paladancer. As children they were friends, until an event caused a scar, not just with one of the two, but also between them. Now they face their greatest adventure, one that brings them from bitter rivals back to a friendship again and beyond, all while they meet new friends of their own, while they find out their bond might be stronger than they would ever imagine. Also there's wyverns.