When an Anvil and Smelter are created and placed inside the zone, Townsfolk can craft advanced metal items and tools such as advanced weapons and armor, as well as kitchen stoves and cooking bowls. An Itesmithy can also be placed inside to enable the construction of ITE based items.
A Forge zone requires at least a 3x3 tiled zone. Anvils, Smelters and Itesmithies can be placed inside the zone to unlock further crafting recipes. Having the Forge zone above-ground and surrounded by walls will increase the efficiency of the Townsfolk working within.