Of Scale and Blood by Keri Arthur

The drakkons have joined the battle, but do they have the power to help win the war?

Princess Bryn Silva is a Strega witch, gifted with the ability to raise fire and mind speak to animals. It is a gift that helped her win the trust of Kaia—a drakkon queen in the prime of her life.

But the drakkons’ only weapons are tooth and claws, and they are useless against an enemy mounted on armored birds, and who possess weapons capable of eating through scale and stone with equal ease. After an aerie is attacked, the drakkons agree to a desperate alliance and the drakkon kin—a force of Strega witches mounted on drakkon back—is formed.
Despite initial success, Bryn quickly realizes that a handful of kin will never defeat the sheer number of gilded riders amassing off Arleeon’s shores.

The drakkons needed a weapon. They needed fire…
But the gilded riders were not the only danger closing in on Esan, the fortress protecting the eastern gateway into Arleeon. The Mareritt, a warrior race and an ancient enemy, also move on them, armed with weapons eerily similar to those the gilded riders use.

Weapons capable of destroying Esan’s mighty walls.
But the biggest threat of all could be the dangerous secrets being held by Bryn’s husband, Damon Velez, heir to the throne of Zephrine and a man she hadn’t wanted to marry but might well be falling in love with.

A man whose magic could give the drakkons fire, or utterly destroy them all.