Volcanic Residue from Sarn's Fire Cave Wall

Volcanic mineral sample from the jagged rock walls of Sarn’s Fire Cave, used specifically for numismaton gas detection.

1 appearances

Appearances in the Narrative

When this object appears and how it's used

1 moments

S21E17 · Planet of Fire Part 3

Doctor uncovers forbidden Time Lord gas

Crumbled volcanic residue from the Fire Cave wall becomes a diagnostic tool in the Doctor’s hands as he smothers a sample for direct sensory analysis. He uses his tongue to isolate traces of numismaton gas—a forbidden gas once integral to regeneration technology—proving its presence through empirical methods.

Before: Embedded in jagged basalt, unseen beneath layers of heat-crusted rock, awaiting discovery or disturbance.

After: Partially consumed by the Doctor’s analysis, its gross form shattered and spread across his hand with lingering grains of suspect composition.

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