The quivering blob, b, is an amoeboid monster in NetHack. Like all blobs, Quivering blob corpses are considered vegan and can safely be eaten. Eating a quivering blob corpse provides 100 nutrition and has a 33% chance of conferring poison resistance. Perhaps unusually as monsters go, there are no special cases in the source code with respect to quivering blobs; all the information about them is given by their status as a blob, and their stats.
Quivering blobs are extremely slow, meaning that they attack infrequently, and cause only minor damage even when they do attack; thus, they are generally considered to not be much of a threat. (Unlike most amoeboid monsters, they do not cause passive damage when attacked.) They also die quickly to most sources of damage; thus, their major tactical and strategic influence on the game is to be eaten for their relatively large chance of conferring poison resistance.
These giant amoeboid creatures look like nothing more than
puddles of slime, but they both live and move, feeding on
metal or wood as well as the occasional dungeon explorer to
supplement their diet.
But we were not on a station platform. We were on the track ahead
as the nightmare, plastic column of fetid black iridescence oozed
tightly onward through its fifteen-foot sinus, gathering unholy
speed and driving before it a spiral, re-thickening cloud of the
pallid abyss vapor. It was a terrible, indescribable thing vaster
than any subway train -- a shapeless congeries of protoplasmic
bubbles, faintly self-luminous, and with myriads of temporary eyes
forming and unforming as pustules of greenish light all over the
tunnel-filling front that bore down upon us, crushing the frantic
penguins and slithering over the glistening floor that it and its
kind had swept so evilly free of all litter.