The shadow sovereign_Aison

Seven years after the Hollowing, humanity survives in walled zones, clinging to crystal-powered technology and the strict mandates of the System. Adrian Mase was a soldier who lived for others, a man who traded his own progress to ensure the survival of the weak. He died in a ditch, unremembered and alone. But the System had a different plan. Adrian wakes in the body of Aison—the most feared A-rank hunter in Japan. He inherits a legacy of blood, a reputation as a monster, and a terrifying power: Eternal Echo. He can pull the dead back from the void as a shadow army, but every soul he commands drains his very life force. To survive, he must master a power he never asked for, hide a secret that could get him killed, and command an army of shadows in a world that is still trying not to die