The Borax Burro (Equus asinus magnus) is frequently confused with the mundane wild burro (Equus asinus), and looks remarkably similar, standing 1.5 meters high at the shoulders (taller than a typical burro), with a bristly erect mane, scanty tail with a bushy tassel, long ears, and varied coloration and markings. It is not clear whether or not it is a toxic variant or an Awakened cousin of the wild burro.

The borax burro is a shy herbivore, preferring mountain slopes. It is either solitary or moves in family groups of two to six individuals. It has a corrosive saliva that can eat through cloth, metal, and even ceramics. The saliva becomes harmless when the burro dies.

The borax burro is mostly seen in the Mojave and Colorado deserts. Also, there have been sightings of this creature in northern Africa. It was initially assumed to be a descendant of the burros used in the borax mine works in Death Valley, hence its name.