I've changed the website address.
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In ember woods lives the Surf Master. He gives out surfing lessions if people give him lava crystals. Lava crystals can be found in the volcano.
If you find and give him one, he'll give you a surfboard, allowing you to cross bodies of water. If you find 4 lava crystals, he'll modify the surfboard giving it a crystal base, allowing you to traverse pools of lava, which you'll need to reach the moletres that lives in the volcano.
This is the interior of the Ignis Volcano.