The Artifact Keeper

This story is set in a world of humans with supernatural abilities and magical artifacts. It is the year 2262 and 90% of humanity has been slaughtered. It has been 20 years since the Kannon started their mass murdering. No one knows why they are decreasing the world's population but a secret organization plans to put a stop to their endless attacks on humanity. Warren is a reckless teenager that wants to put an end to this war, however, he is powerless. Was he born without powers or will his power awaken in time before he faces some of the strongest warriors left alive?