Robo-scorpion

The robo-scorpion is a special security robot 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, and a red tail. The other parts are green.

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 system 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, after hacking his colleagues and altering their personalities, chronometers, and geometers, among other things, was disgusted by his actions against his friends and erased some parts of his own memory to ease his conscience, including the knowledge of his creations. Later, Mobius removed himself to the X-42 robo-warfare facility which he renamed the "Forbidden Zone" and began to "re-create" the robo-scorpion, now based on the radscorpions 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 the control of the previous models of robo-scorpions and they became his personal army, principally used to constantly distract the Think Tank.

Characteristics
Robo-scorpions are very fast and extremely resistant to most damage. The effect of pulse weapons cause less damage to them compared to other robots. The X-42 giant robo-scorpion is a special model adorned with a Saturnite armor plating, making it virtually impervious to small arms fire and an improved EMP shield. It is also equipped with a powerful tail-atomic laser, with which it draws the required energy from its internal generator, which 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 area of about 3 meters. It also equipped with a self-destruct system like other robo-scorpions but with a small nuclear device, leaving radiation of about 15 rads first and decreasing every second, stopping after five seconds.

Variants
Robo-scorpions appear in Mk. 1, 2, 3, 3b, 4, 5, 5b, and come in stinger, 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.

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 Stealth Boy integrated in them.

X-42 giant robo-scorpion
Encountered in the Forbidden Zone, the X-42 giant robo-scorpion is a unique robo-scorpion and Dr. 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 rad per second.

Bugs

 * Sometimes when encountering the X-42 giant robo-scorpion, it will not make hostile contact with the player, making the fight a whole lot easier.
 * Some roboscorpions may continue to quote Mobius if the player completes Old World Blues without killing him (confirmed on Xbox 360)

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.
 * "Robo-scorpion... attack!"nvdlc03gen attack 00015ed9 1.ogg
 * "Go my minion, sting them in the name of all that is Mobius."nvdlc03gen attack 00015eda 1.ogg
 * "X-42, attack! In the name of Mobius!"nvdlc03gen attack 00015ee0 1.ogg
 * "Stop that, you'll damage the hull!"nvdlc03gen hit 00015e7b 1.ogg
 * "Destroy this one, I'll make more!" nvdlc03gen hit 00015e7d 1.ogg

Appearances
Robo-scorpions appear only in the Fallout: New Vegas add-on Old World Blues.

Behind the scenes

 * The robo-scorpion is based on the scorpitron of Wasteland, the 1980s game which is considered to be Fallout's predecessor.