Every month, a young mare or stallion arrives from the top of the Tower, in a deep sleep. They remember nothing about their past. When they reach the base, they wake up. There, other ponies help them survive in this strange place. Unicorns have minimal magic, Earth Ponies are weak, and Pegasi can barely fly. These three races have no power. This process has been going on for more than two years now, and nobody has been able to leave. One day, everything changes. A hybrid is sent to the Tower.