The Conquer Robots' relatives are also super strong. But unlike the Conquer Robots who were poor and needed a potion to upgrade them, the Relatives were already super strong when they were born. Even so, they were not as powerful as the Conquer Robots who came to threaten their city every day.
The Relatives practiced and trained every day. They became tougher as they grew. Later on, they received superpowers from their king, whose name was Conquer Robot Master Relative. Their superpowers were laser eyes, super strength, and invisibility.
That was how they became stronger. In the end, the Conquer Robots lost their strength and power after the potion left their bodies. The Relatives defeated them, but the Conquer Robots remained powerful.
The Relatives worked together and finally put an end to the Conquer Robot King.