Riders Of The Wyvern: The Draglin's Scale

Sinial, A 15 year old boy, Is the rider of a wyvern. The wyverns with their riders, hunted down and killed almost all of the dragons.
All the ones that are left have gone into hiding, Except one, An Ourobas. It surrounds the last dragon egg, one that Sinial is destined to find.
It is said that whoever find the egg and destroys it will gain more power than any dragon in existence.
but his best friend hunts it too. When Sinial takes it for himself, Masin is enraged. With his Griffin, he joins the wyvern army in an attempt to destroy Sinial before its to late.