The Rust Devils are a group of Raiders that originated from the commonwealth but was forced back thanks to The Sole Survivor continuously interfering with them. Unlike the other raiders of The Commonwealth, they use robots and robotic parts for their arsenal, making their own robotic army out of scrap and ruined pieces of previously broken down robots that were either already in ruin or destoryed by The Rust Devils. As they arrived at the state of Missouri, they established their base on the ruins of Edina city and made war with the Missouri Rangers and The Undead Conquerors.

They are open to join, however the player would need to convince them into letting them in by either having high repair or speech, having a robotic based perk or assisting them on clearing out a nearby Undead Conqueror camp and gathering a part they need for their robots.