Mineral mephits were bulky and rigid, as were earth mephits. Their metal wings glittered with shiny pieces of silica, but didn't actually function during flight. These odorless mephits were very clumsy during such flight.
These creatures could pass through stone walls up to 1 ft (0.3 m) thick, as if they were insubstantial. Oddly enough, these mineral mephits didn't breathe at all.
Such mephits were self-centered, stubborn, and greedy, an attitude typical of those of their home plane. They guarded their own treasure vigilantly, and may have guarded valuables belonging to other creatures.
They were immune to all gas-based attacks and spells, such as those that filled areas with stinking gas. Non-magical weapons that pierced did not affect them, but transmuting rock to mud would instantly morph their shape, killing them. When in contact with rocks or jewelry, they could regenerate quickly, but consumed gems in the process.
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