Robo - scorpion The robo - scorpion is a special security produced by the Big MT research company to serve as robotic guardians for the Big Mountain Research and Development Center . They have a scorpion form with a yellow body , two red pincers , red tail , and green trim along the side of the body and the tail . Background . The original robo - scorpion was created before the Great War by Dr . Mobius and his team in the X - 42 robo - warfare facility in Big MT , based on scorpions and powered by a fission battery . They were created for security at the Big Mountain Research and Development Center as robotic guardians with a tail - mounted energy bolt blaster , optical systems allowing anyone in the X - 42 robo - warfare facility to see through them with monitors , and a self - destruct sequence which , after their death , causes electrical explosion damage to anyone around . Additionally , their public address systems allow anyone in the X - 42 robo - warfare facility to speak through them . According to Mobius , they can form themselves from floor panels along with any other random parts lying around . X - 42 giant robo - scorpions , unlike the others , were a project for the US military . Despite 18 prototypes being requested , certain kinks in design and programming prevented them from reaching battlefield deployment and only one functional prototype was completely finished , remaining idle in the X - 42 robo - warfare facility . Sometime after the Great War , Mobius hacked his colleagues and altered their personalities , chronometers , geometers and more . Disgusted by his own actions against his friends , Mobius erased some parts of his memory to ease his conscience , including the knowledge of his creations . Later , Mobius relocated to the X - 42 robo - warfare facility which he renamed the " Forbidden Zone . " There he began to " re - create " the robo - scorpion , now based on the radscorpion s which occasionally wandered into the Big MT . He added the suffix " b " onto his new creations and retained all features of the pre - War model . He also took control of the previous models of robo - scorpions making them his personal army . Mobius now uses the robo - scorpions to constantly distract the Think Tank . Characteristics . Robo - scorpions are very fast and extremely resistant to most damage . Pulse weapons are less effective against them compared to other robots . The X - 42 giant robo - scorpion is a special model adorned with Saturnite armor plating , making it virtually impervious to small arms fire , but is vulnerable against pulse weapons . Its tail is equipped with a powerful atomic laser that draws its energy from an internal generator . The laser is capable of causing severe damage and leaving residual radiation of about 30 rads per second for one second , as well as having a blast radius of about 3 meters . It is also equipped with a self - destruct system like other robo - scorpions , but detonates a small nuclear device instead of an electrical explosion . The X - 42 giant robo - scorpion ' s self - destruct explosion leaves radiation of about 15 rads for the first second which decreases every subsequent second , stopping after five seconds . Variants . Robo - scorpions appear in Mk . 1 - 5 and Mk . 1b - 5b ( Data for Mk . 2 and Mk . 2b exist , but both are unused ) , and come in pincer , blaster , and bomber variants , as well as different sizes relative to their Mark . Their appearance in the game depends on the player level and importance of the location in which they appear . Regular series . The normal robo - scorpions without any special attributes . Pincer series . The fastest robo - scorpions . They can only use their pincers and use melee quickly . Blaster series . These shoot a long - distance electric blue beam from their tail with an average rate of fire and very high damage . Bomber series . They have the ability to become invisible due to the integrated in them . X - 42 giant robo - scorpion . Encountered in the Forbidden Zone dome during the Old World Blues quest , the X - 42 giant robo - scorpion is a unique robo - scorpion and Doctor Mobius ' ultimate guardian . It is armed with a powerful atomic laser capable of causing severe damage and radiation damage of about 30 rads per second for one second as well as having a blast radius of about that of a pulse grenade . It sometimes fires at you while you are behind cover , and you will still absorb the reduced amount of radiation , about 2 - 15 rads per second . Notable quotes . It should be noted that quotes are from the robo - scorpions , but are transmitted to the Courier by Mobius through the robo - scorpions ' public address systems connected to the X - 42 robo - warfare facility . Appearances . Robo - scorpions appear only in the " " " Old World Blues " . Behind the scenes . The robo - scorpion is based on the scorpitron of " Wasteland " , the 1980 ' s game which is considered to be " Fallout " ' s predecessor .