From Destinypedia, the Destiny wiki
The Technocrat's Iron is a military factory for the House of Salvation with the purpose of creating advanced weaponry. It is aptly named after its military commander, Praksis, the Technocrat, who was responsible for creating a lot of the House's technology. It can be accessed through Riis-Reborn Approach and is heavily guarded by Fallen troops. Outside factory is a loading bay for Skiffs that patrol the skies of Riis-Reborn.
The manufacturing plant also produces Brigs and Walkers and was most prominently featured in the Sabotaging Salvation story mission. Guardians were tasked by Commander Zavala to disrupt their efforts and with the aid of Variks, the Loyal, they breached through their security through unconventional means and hacked into their Brigs to cause them to implode. Later, it was discovered that the House of Salvation imported technology from the House of Devils and Kell's Scourge and began manufacturing Factory Walkers and Factory Brigs to further enhance their military on Europa. The Fallen also clashed against the Vex who invaded the city of Riis-Reborn and occasionally be seen patrolling the area.
List of appearances