Becoming Overpowered After Every Offering

|| Your sacrifice has been accepted! || || S-rank skill has been rewarded! || || SS-rank bloodline has awakened! || || Monkey king has been summoned! || --- Once the apocalypse began, Draven found himself in a desperate, life-or-death struggle—and was confronted by a powerful voice demanding a sacrifice to cure his zombie infection. Confused and desperate to survive, he gambled with what he treasured most. To his astonishment, not only was he cured, but he also gained a living weapon that grows by devouring the souls of every enemy it slays—and a mysterious system to guide his path to power. With each offering to the system, an even greater reward is unlocked Attribute points? Special boosts? Unique skills? Divine bloodlines? Powerful mythical figures?