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From Pathfinder #146: Cult of Cinders, which isn't enabled.

Repair Crumbled Walls

ACTION

Requirements Crafting (expert), Specialty Crafting (stonemasonry), or hired stonemason; organized workers

You work to repair a collapsed wall in either the training hall (area A8), the Court of the Nail (area A13), or the records room (area A17). Each room's repair takes 8 days of work and a DC 20 Crafting check.

Pathfinder #146: Cult of CindersOGL