Void War: The Elemental Progeny

When Velus, a teenage street urchin, is wrongly convicted of murder and sentenced into slavery, he never thought he would be destined for greatness. After nearly two decades of abuse, an alien force destroys his master's estate and Velus flees on foot.

Velus' journey begins in pain and confusion, and being rather naive from decades of servitude, falls into trouble. Rescued by a trio hunting down the thief of a sacred relic, Velus joins their cause and re-encounters the savage aliens that unknowingly aided his escape. They're working on extracting the Dral, a powerful and evil race, from their elemental prison; with the relic as a focal point for the key.
Through seemingly random encounters, he is thrown into events that will ultimately shape the outcome of a galactic war, and possibly the fabric of the universe itself.

The Elemental Progeny is book one of the Gatekeeper Trilogy.