Humanity battles extinction against the Vicious Dalki, sparking the emergence of hidden warriors dormant for centuries. These ancient bloodlines surge forward—some unite humanity's defenses, others selfishly guard their powers. Quinn lost everything: his family, his home, his fate. Only an ancient sealed book remained, its secrets locked away. When the tome finally opened, a system granted Quinn incredible strength. Quest after quest elevated him beyond human limits, each challenge making him stronger. Then the system issued its fateful command: 'Time to feed.' 'Consume human blood within 24 hours.' 'Your HP decreases until completion.' Quinn faced an impossible choice—evolve into darkness or perish as his own power consumed him.