Battle Mage: Aquila (The Souls of Wrath) by Peter Flannery

For years, Aquila Danté has been fighting the Possessed with his dragon, Calon Tân. Together with the human armies, they are holding the legions of hell at bay. But when a battle mage goes missing, Aquila and Tân encounter a new and terrifying demon known as Caim, The Cleaver of Souls.

Even as Aquila confronts Caim, his wife is giving birth to their son, but fate deals a cruel blow and Aquila begins a new battle against tragedy, grief and the endless machinations of the magi. And all the while, the scales of his beloved dragon grow darker. Calon Tân will soon turn black, and as everyone knows, black dragons are the enemy of humankind.
Black dragons are mad.

As Aquila and Tân fight to keep the madness at bay, another child is born in the Forsaken Lands of Beltane. Daughter to a healer and a failed battle mage, this child must survive years of danger and hardship. Only then will she receive her tribal name and ignite a spark of hope.

Heroes fall, and new heroes rise in the epic tale of Aquila, a battle mage who sows the seeds of victory even as his own tragic fate is sealed.