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A metal pillar.
A Metal Pillar was a craftable, placeable item made out of Low Quality Metal. Metal Pillars had to be initially placed on a Metal Foundation. Other metal structural items such as Metal Walls, Metal Doorways and Metal Ceilings could only be placed between metal pillars, (Metal Doors are not included in this as they could be placed in a Wood Doorway or Wood Shelter). Like Wood Pillars, Metal Pillars could not be manually damaged or destroyed by any means and could only be harmed by Decay.