The Endless Walk is the punishment in which a ghoul from the Reservation is stripped of every worldly possession, including clothing, and sent marching into the wasteland. No ghoul has ever come back from the Endless Walk (one exiled from the Reservation, Otto Steed, was saved by Governor Dodge at Hoover Dam). Another source of Endless Walkers in the Boulder area is the crater, the remains of NORAD.
Not all Endless Walkers end up scorpion food, at least not at first. On those rare occasions when one survives more than one year in the wasteland, they turn into wandering, voracious creatures on an endless quest for flesh. Due to their prolonged, open exposure to the desert sun, high radiation, and other hardships of the wasteland, these unfortunate ghouls' skin has toughened into a natural, hardened leather, but at the same time, their brains have been completely cooked.
Endless walkers who have been in the wastes for so long become creatures of instinct and will attack anything that moves in a vain effort to quench an appetite that can never be quenched. Also, their skin is very tough and they strike with their claw-like hands with surprising quickness. Fortunately, endless walkers do not travel in groups. In fact, it is a rare occasion when someone comes across one, though most who travel this side of the wasteland like to keep their distance from the ravenous creatures. Though encounters with Endless Walkers are rare, when someone does encounter them, they are assured to never forget the encounter, if they survive.