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The Sun Stone was used as the primary energy source by the Kingdom of Zeal before the advent of Lavos and the Mammon Machine. When it runs out of energy, it becomes a Moon Stone. It can be turned back into the Sun Stone, but it must be left in the sun for a period of over 65 million years.
It was briefly stolen in the year 1000 A.D. by an explorer, who delivers it to the Porre Mayor. although the changes in time, As the mayor was originally greedy, became a jolly man who surrenders the stone to the party without a hitch.