Cascadus

History
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Composition and Structure
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Geographic Areas
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Irithril
Irithril is an element found sporadically throughout the crust of Cascadus in large, but uncommon pockets. It is difficult to identify, as it looks so close to typical granite. Expert opinion or knowledge is generally required to identify irithril.

The element is known to cause pronounced but wildly varying psychological effects, depending on specific geographic circumstances, in humanoids that are passively exposed to it.