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It is this unique diet that makes Spinarran’s a such a valued species. Spinarrans dig deep underground and eat the rocks and ore they dig up. Some of these minerals are used to make their remarkably hard metallic chitin and their carbon filament silk. The excess metal is expelled as waste in the form of concentrated metal spheres of astounding purity. When spinarran’s gorge themselves on metallic ore, it can force them to go through rapid molting, shedding their carapace to make a new one from the ore they are consuming. Over eating too causes them to repeatedly molt their refined chitin, which then can be melted down and be used. Their services as miners and prospectors are in high demand as all they have to do is be brought in and directed to ore veins; the Spinarrans will dig and eat to their heart’s content, making purified metal as they go.