Starting from Being an Undercover Monster and Becoming Stronger

You can become stronger by killing monsters, but I am an undercover agent sent by monsters to humans. In order to become stronger, I will do whatever it takes. Eating, drinking, fighting monsters, every effort, the system can make me stronger. A few years later, when Lin Duan became the strongest among humans, he also became the supreme commander of the monster army. "Give up your life for me." Lin Duan commanded the mighty monster army under his command to walk into the trap that was preset in advance. Then a huge ray of light poured from the clouds onto the earth, completely wiping out the endless swarm of monsters. "What have you done!" The space was torn apart, and the gods of the monsters stretched out their hands to completely destroy the traitors. However, at this moment, Lin Duan had already obtained a power that was even higher than it. "Next, it's your turn."