It was a thick puddle of gray sludge, roughly 8 inches (20 centimeters) thick, 3 inches (7.6 centimeters) wide, and up to 12 feet (3.7 meters) across, that closely resembled wet stone or an amorphous rock formation.
When one of these creatures reached an exceptionally large they were known to mildly develop greater intellect.
Gray oozes reproduced by breaking small droplets off of them after a meal, called 'budding', which later grew into gray oozes themselves.
When one of these creatures reached an exceptionally large they would develop latent psionics, allowing them to unleash a psychic crush, but in return be left vulnerable to retaliation. They were only known to unleash this ability whenever a creature within 6 feet (1.8 meters) of them used psionic powers. It was suggested that gray oozes developed these psionic abilities having evolved to live near Mind flayers.
Gray oozes were known to attack in groups, dissolving enemies and absorbing their bones as slime to grow. It attacked by striking until its prey was either dead or unconscious, moving on top of them afterwards to digest them from within. Gray oozes were particularly feared for the fact that they were transparent. This made them difficult to detect while they were still or moving slowly.
Gray oozes were known to be found in subterranean areas, such as caverns and dungeons. They were mindless scavengers who dragged themselves around caves or sewers, while absorbing and digesting whatever they came across. Unlike other oozes, the gray variety couldn't move on ceilings or walls, hence it was left to slide its way along subterranean floors.
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