Gelatinous cube

So nearly transparent that they are difficult to see, gelatinous cubes travel down dungeon corridors, absorbing carrion and trash along the way. Their sides glisten, tending to leave a slimy trail, but gelatinous cubes cannot climb walls or cling to ceilings. Very large cubes grow tall to garner mosses and the like from ceilings.

A gelatinous cube attacks by touching its victim with its anesthetizing slime. An unlucky victim is paralyzed (anesthetized) for several minutes, allowing the cube to surround its prey and absorb it. Possessing no intelligence, gelatinous cubes live only for eating. They prefer well-traveled dungeons where there is always food to scavenge. These creatures reproduce by budding, leaving clear, rubbery cubes in dark corners or on heaps of trash. Young are not protected and are sometimes reabsorbed by the parent.

Note: The gelatinous cube originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.