Dragonfate: Dragon's Oath - Dragonfate, #3

Book 3 of the Dragonfate series. Days are speeding by, and time is growing short for the inhabitants of the land called Altruaeda. Chaotic magics are tearing the world apart, monsters are emerging from their dark dwellings, and the threat to the few remaining dragons grows with every passing hour. Half-Ruby Dragon Kyaza has been charged with the task of restoring the land to safety, but as his own fate spirals further out of his control, his certainty grows that those who chose him have made a terrible mistake.