Invincible Heroes: I Can Upgrade Everything

Eagle Eye is a ** skill? I can use it to copy the abilities of troops! Give the vampire's blood-sucking skill to the swordsman, copy the bull's eye of death to the priest, and give Behemoth's ability to ignore the opponent's defense to the angel... Academics are the only skills? I can use it to learn the specialties of other heroes! Defense, archery, offense, conversion to marksman, conversion to magic mage... Roger traveled to a world where heroes are invincible, and the upgrade route is all about advanced skills. However, he has a system that can upgrade everything, and can add additional abilities to skills, treasures, and units. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.