Gelatinous Cube

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.

Slow Death.

An ooze kills its prey slowly. Some varieties, such as black puddings and gelatinous cubes, engulf creatures to prevent escape. The only upside of this torturous death is that a victim’s comrades can come to the rescue before it is too late.
Since not every ooze digests every type of substance, some have coins, metal gear, bones, and other debris suspended within their quivering bodies. A slain ooze can be a rich source of treasure for its killers.

Unwitting Servants.

Although an ooze lacks the intelligence to ally itself with other creatures, others that understand an ooze’s need to feed might lure it into a location where it can be of use to them. Clever monsters keep oozes around to defend passageways or consume refuse. Likewise, an ooze can be enticed into a pit trap, where its captors feed it often enough to prevent it from coming after them. Crafty creatures place torches and flaming braziers in strategic areas to dissuade an ooze from leaving a particular tunnel or room.

Spawn of Juiblex.

According to the Demonomicon of Iggwilv and other sources, oozes are scattered fragments or offspring of the demon lord Juiblex. Whether this is true or not, the Faceless Lord is one of the few beings that can control oozes and imbue them with a modicum of intelligence. Most of the time, oozes have no sense of tactics or self-preservation. They are direct and predictable, attacking and eating without cunning. Under the control of Juiblex, they exhibit glimmers of sentience and malevolent intent.

Ooze Nature.

An ooze doesn’t require sleep.

Encountering The Collective

The Collective first encountered a Gelatinous Cube while delving in Delmans sewers. Looking for puffbloom mushrooms for Sineas the group came upon a cube guarding a puzzle room. Once the cube was defeated it dropped a ship in the bottle. The ship later revealed to be The Nekkid Nymph.