Rust Devils (Automatron)

Background
The Rust Devils are Similar to Raiders and The Forged, Diffrence is that they tend to use robotic scrap parts as armour and construct Robotics to defend their base. The can only be found at Fort Hagen satellite array, Their base of operations, they will attack anyone and everyone on sight.

Based on Ada's words, Ada's Caravan encountered them while crossing a river into a city, presumably Diamond City, who utilized robots for their nefarious practices. The Scavenge through the Commonwealth looking for functional robots and if the cant capture or reprogram these functional Robots, they strip them into parts, making them into armour or spare parts for the Re-programmed bots.

Related Quest
BLAH BLAH, I'll do this another time