Blood Evolution System: I Level Up by Draining Power

War has shattered humanity's last stronghold. When the monstrous Dalki invade, Xu Ran loses everything—his family, his home, his future. All he has left is a cryptic ancient tome that refuses to open. The day it finally awakens, Xu Ran discovers a terrifying truth: his new system demands blood to evolve. Each mission pushes him deeper into darkness as his abilities skyrocket beyond human limits. But power comes at a price, and the system's final task may cost him his humanity itself. In a world where awakened beings hoard their secrets and survival means crossing every moral line, how far will…