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Oil pots are defensive castle buildings that can be placed on castle walls in order to damage enemy troops. Oil pots are poured automatically upon approaching enemy troops, dealing damage in a 3x3 square in front of the pot. Whereas in previous Stronghold games the oil pots were refilled by an engineer after use, in Kingdoms the pots must be replaced when used. The Smelter building is required in order to place oil pots, and each has room for 5 (more must be built in order to place more oil pots).