Radscorpions are mutated from the North American Emperor scorpion, which were prolific in many pet stores at the time of the Great War. Contrary to many expectations, their venom grew more potent when they mutated rather than becoming diluted. Though considered nocturnal and sensitive to light, radscorpions can be found active during the daytime in the areas they inhabit. Samples of their venom can be used to make antivenom.
The radscorpion is a large, venomous creature that not only deals high damage but it can also poison the player with its deadly venom. Be ready for a good fight if you don't intend on running if you see one of these threatening creatures.
Radscorpions, of all variants, are vicious enemies. They have rock-solid carapaces which can withstand considerable amounts of damage, and their stingers are filled with potent poison. They almost always gather in packs of at least four individuals, and are incredibly deadly to unprepared players.
Lesser radscorpions are diminutive when compared to their larger brethren, and pose less of a threat. Nonetheless, their stingers still inject deadly radscorpion poison into their foes, and as such are dangerous to unprepared travellers.
The regular radscorpion appears in both Fallout and Fallout 2. The nasty radscorpion appears only in Fallout and the lesser, the black lesser and the regular black radscorpion appears only in Fallout 2.
↑Razlo dialogue file - "They seem to be extremely large versions of the north American Emperor scorpion."In-game spelling, punctuation and/or grammar
↑Chris Avellone, Fallout Bible 1 - "The radscorpions are a result of a combination of radiation and the FEV virus, and Razlo in Shady Sands is correct - they were originally Emperor Scorpions that have grown... big."