Kalran: Tales of the four nations/Foundry

When the Federation began to focus on finding ways to protect themselves in the event the vault is attacked they invested in at first in the defenses they used back in the 3rd age.

At first the improvements were minor, changing the HMGs and cannon into laser and missiles, but as they began updating their defenses more, changing the position manned by Humans into ai and putting in remote control and building new turrets to cover any gaps, when they found a problem. The computer databanks can't hold all the designs at once without making it impractically huge and/or power intensive. And began find solutions until the the obvious came, just split the designs into multiple databanks. And thus birthed the foundries.

The foundry works by the base teleporting prefabricated parts into it followed by the foundry sending out its nanobots to build the defenses on site. Do note that the foundry can only queue up one defense at a time, so if you want to make multiple defenses at once its recommended that the commander build more then one foundry.

Support foundry
Simply put. The support foundry is built to create auxiliary defenses, which are to support the proper turrets, and is the cheapest of the three.