Smithery is a Tier Three technology after Mining in the Climbing branch that allows you to build forges and unlocks the Swordsman unit.

Forges produce 2 population for the city's in which borders they are in for every adjacent Mine. The mines don't need to be inside the respective city's borders in order for the forge to count them. You can only build one forge per city.

The Vengir tribe starts with this technology.