A full character turnaround sheet of a crystalline geomancer, underground sage from the hollow mountain kingdom, translucent quartz skin with branching amethyst vein patterns and glowing geode tattoo markings that pulse with seismic energy, flowing robes woven from solidified gemstone dust and cave moss with embedded earth sigils, intricate armor of raw emerald and crystallized quartz with etched runic stone symbols, massive floating crystal islands of cascading gemstone ribbons and swirling mineral mist hovering around, clutching a legendary staff made of living obsidian and captured earthquake essence, dozens of tiny mineral sprite familiars with soft amber light floating like living gems, dramatic underground bioluminescent backlighting with towering crystal spire silhouettes and falling crystal dust particle curtains, deep cavern black crystal purple emerald amber obsidian gold ancient stone and glowing mineral color palette, Painterly digital art style, concept art for video game, front and back view with crystalline geomancer lore details