A translucent magma-salamander with crystalline obsidian bones visible through its heat-resistant amber glass skin, gliding across steaming travertine terraces in a volcanic underworld cavern where copper-colored mineral springs bubble and glow, scientific field notes cross-section mapping heat-dissipation capillary networks and geothermal sensory organs, palette of deep volcanic obsidian, phosphorescent magma orange, mineral copper gold and pale steam white, Victorian natural history geological expedition illustration aesthetic