One possibility is that bracing materials to hold up the roof are valuable trade goods in the Ork Underground, and there are orkish experts (trained in a tradition started by goblinized geology professors) who occasionally get extracted when someone needs a tunnel building expert.

Another is that “turn this compacted sediment into sedimentary rock” is a straightforward physical service for earth spirits, and shamans in the Ork Underground often do that to make the tunnels and chambers more secure.


I should reread Parageology and come up with a name for sedimentary rock created through spirit action...

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Looks like Greek roots are in order, so I’ll go with “eidolonite”.

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