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As Aberno saw all these Green Skins marching and fighting, and dying against the enormous power of the heroes, he realized they were slowly slowing down in their speed, the troops were too many and they were slowly being moved back to a corner, Aberno smiled a bit, believing his tactic was working. There was a big portal behind him leading to the demon continent, where more green skins were marching towards here, flooding the entire jungle, thousands after thousands of them. Heroes were powerful, they were incredible and capable of defeating the mightiest of monsters, but they were not invisible, they had a limited amount of energy, and could get tired ultimately, as they were still mortals and not gods.
Check "The Protagnist's Sister Is Actually the Strongest"!