What Adaptation would Humans in a Volcanic Underworld Develop?

The TBD are a fantasy humanity offshoot that is fully adapted to life a few kilometers beneath the surface, settling in cracked earth near vents and hot spots.

Air quality ranges from stale to toxic, including sulphur vapor and vitriolic fumes that condense on the walls. Water is available in reservoirs further from the vents, and occasionally in condensation. Fungus-like life feeds on the upwelling chemistry, and there exists an ecosystem of mycanovores and carnivores around the fungus.

Light is available in the blue flames of burning silver deposits and orange glow exposed hot rock. The amount of light is equivalent to moonlight. A little like the lava lakes of Erta Ale and the surface sulfur mines of Sicily, but underground and provided enough air by some undefined source.

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What Adaptation would Humans in a Volcanic Underworld Develop?

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