Warriors - David Samuel

When fourteen-year-old Aaron Hunter finally meets his disgraced scientific hero, Eric Woods, he's violently thrust into an ancient cosmic war that Earth never knew existed. Now, wielding mysterious powers and fighting alongside unlikely allies, Aaron must confront an unknown and brutal being who holds the key to Earth’s extinction. But becoming a warrior may cost Aaron everything, including his humanity. As it dawns on Aaron that the cosmic war spans multiple lives and dimensions, he realises this conflict hinges on the decisions he will make and the battles he will face. When the final battle threatens everything he loves, Aaron must make an impossible choice: embrace his warrior destiny or watch humanity fall to an enemy who knows him better than himself.