It seems three duergar in particular have been seen about finding work and excavating somewhere in the area of where Edonil collapsed.

//If fallowed// It appears the are working in the living city and studying necromancy. They venture to the surface to gather wood and stone as well as mining it below. They seem to make potions, wands, scrolls, and the like often.
Mining of gems and refining of metals can be seen as well.

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