Dawn of the Construct: Book 1 of the Soul Machine Saga

Earth is a prison and you're living in it. It's called The Construct and its keepers carefully manage the rise and fall of humanity in order to extract soul energy to fuel the galactic expansion of an alien race... but we'll get to that. When an enigmatic magic known as the Astrig Ka'a turns D'avry's life upside down, he finds himself in a struggle to save humanity, not only in his own time and place but throughout Earth's untold histories as well - histories replete with mechanized armor, ...