I Went on a Killing Spree with the Rules

Chen Jian lay on the ground, covered in blood. The Demon Emperor, Ziye, walked up behind him and stepped on his head. With a vicious grin, he said, “So these are the people you gave your life to protect! Can you hear them? They’re begging me to execute you!” The System’s voice rang in Chen Jian’s ear: “Host, would you like to fall into darkness and declare war on the entire world?”