Dark Sun: The Scorched World of Athas
The only purpose oozes serve in the world is to wipe clean the dilapidated, forgotten and ruined places and free them of vermin, refuse, and adventurers.
A black pudding resembles a heaving mound of sticky black sludge. In dim passageways, the pudding appears to be little more than a blot of shadow. Flesh, wood, metal, and bone dissolve when the pudding ebbs over them. Stone remains behind, wiped clean.
Gelatinous cubes scour dungeon passages in silent, predictable patterns, leaving perfectly clean paths in their wake. They consume living tissue while leaving bones and other materials undissolved. A gelatinous cube is all but transparent, making it hard to spot until it attacks. A cube that is well fed can be easier to spot, since its victims’ bones, coins, and other objects can be seen suspended inside the creature.
Wretched piles of stinking pus, gray oozes seek to dissolve the bones of other creatures into slime, which they use to increase their bulk. Gray oozes are major nuisances in archaeological expeditions. Having fed on buried bones, they seek fresher targets among excavators and adventurers.
Ochre jellies are yellowish blobs that can slide under doors and through narrow cracks in pursuit of creatures to devour. They have enough bestial cunning to avoid large groups of enemies. An ochre jelly follows at a safe distance as it pursues its meal. Its digestive enzymes dissolve flesh quickly but have no effect on other substances such as bone, wood, and metal.