The subterranean staircase of black volcanic glass descended two hundred steps into the freezing subterranean depths beneath the Blackwood Redoubt. With every step downward, the air grew denser, filled with the concussive, rhythmic throbbing of immense hydraulic pressures locked behind cyclopean granite bulkheads. The temperature fluctuated wildly: one moment carrying the bone-chilling alpine frost of glacial meltwater, the next carrying the sulfurous, scalding vapor of geothermal vents bubbling up from…
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