The "Urchin" is possibly a fossilized species of fauna (or flora), resembling the likeness of a giant sea-urchin. Speculation has lead to the theory that said Urchins indicate the heightened water level at some previous point in time. The Urchin is specifically named "LandUrchin01" within the game files.
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Location
Urchins can be found in many areas of the map, prominently in the southern part of Border Zone and Stenn Desert.