The Penniel Effect (Gospel of Raine, #1)

The search for intelligent life goes too far when ambitious aeronautics company Daemon Technologies steals an artifact from an alien world. Its inhabitants, powerful creatures called Nails, drive the human trespassers back to Planet Edom where they are forced to regroup. Within a generation, Daemon builds military academies around the world in search for soldiers capable of using the stolen technology, forged into humanoid war-machines called Voices, against their newfound enemy.

Among those cadets is star mech-pilot Raine Learsi, a troubled teen who secretly vows to destroy her corrupt corporate sponsor. However, the Nails strike first, and all she and her fellow pilots have are each other. Plunged into an interstellar war she wants no part of, Raine must put aside her differences to protect her home from the mysterious invaders.