The Moon Kingdom, though it had a fairy-tale appearance, demonstrated an advanced technology. It existed within a dome which produced an artificial climate, and had an advanced computer called the Eternity Main System . ^{Those who resided in the Moon Kingdom were long-lived beings and had two specific duties: First, they were to protect the Silver Crystal, a powerful holy stone which had been handed down through the generations. Second, they were to watch over the evolution of Earth and protect it from any negative influence.}