Raffrok: n. electric rock (Icelandic)

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Isle Raffrok is a small isle made mostly of sandstone with scattered remnants of architectural landmarks and extraterrestrial intelligence. On the isle exists a hidden entrance to the Lost Caverns. 

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However, in order to enter the player must have recovered the 4 elemental stones required to power on the core generator. Once powered on, this generator reveals and opens a sealed door in the side of the mountain wall.