The stone is hidden down an out-of-the-way staircase in the southeastern section of the castle. A magic key is required to access the staircase. The player must speak to the sage to receive it.
Dragon Quest III
The Sun Stone is in a hidden chamber on the first floor of the castle. When the final boss is defeated, the stone can be handed down to the sage that has it in Dragon Quest, fulfilling the prophetic dream that he had.
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