|This page pertains solely to Kingdom: Two Crowns.|
- For other shrines, see: Statues.
The iron technology unlocks the forge and higher tiers of towers, walls, and the Town Center. Without this tech, these Kingdom structures can only reach the stone tier. After paying for this tech in the fourth island, the Monarch is allowed to upgrade them to the iron tier on any island, even if the Monarch dies.
Builders are not required to build the iron mine as it builds itself.