I, the Big Devil! Counterattack on Fairyland

After the war between immortals and demons eight hundred years ago, they all killed the great demon king and was imprisoned under the endless abyss. Today, eight hundred years later, it was a time when everyone was about to die. At this time, the counterattack system suddenly awakened! You can get certain rewards by conquering any territory. "Successfully occupied the endless abyss and obtained the Book of the Dead" "Counterattack the first demon king's city in the demon world and obtain the blood of the demon ancestor*1" "Successfully counterattacked the number one holy land in the world of immortality, and the reward is the magical power of rain when turning one's hand over the other's hands." "Successfully counterattacked the world of cultivating immortals! Obtained the reward of Origin Heart" "Successfully counterattacked the fairy world..." A great demon king was born, "I will kill everyone, and everyone in the world will be killed!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.