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Gelatinous Cube

Found underground or in dungeons, these quivering cubes of slime continuously scour their domain for food. The acid in their bodies is weak enough that many gelatinous cubes still contain the gear of their victims, as they’re unable to break them down.

Recall Knowledge - Ooze (Occultism): DC 18

Gelatinous CubeCreature 3

NLargeMindlessOoze
Source Bestiary pg. 254
Perception +5; motion sense 60 feet, no vision
Skills Athletics +11 (+13 to Shove)
Str +4, Dex -5, Con +5, Int -5, Wis +0, Cha -5
Motion Sense A gelatinous cube can sense nearby motion through vibration and air movement.
Transparent A gelatinous cube is so clear that it’s difficult to spot. A successful DC 23 Perception check is required to notice a stationary cube, and a creature must be Searching to attempt this check. A creature that walks into the cube is automatically Engulfed (this usually causes the GM to call for initiative).
AC 10, Fort +12, Ref +0, Will +5
HP 90; Immunities acid, critical hits, mental, precision, unconscious, visual; Resistances electricity 5
Speed 15 feet
Melee Single ActionSingle Action cube face +11, Damage 1d6 acid plus paralysisEngulf Two ActionsTwo Actions DC 19, 2d6 acid, Escape DC 19, Rupture 7. A creature Engulfed by the gelatinous cube must also attempt a saving throw against paralysis.Paralysis (incapacitation) A creature Engulfed by the cube or hit by its attack is paralyzed unless it succeeds at a DC 20 Fortitude save. A victim can attempt a new save to recover at the end of each of its turns.Weak Acid A gelatinous cube's acid damages only organic material—not metal, stone, or other inorganic substances.

All Monsters in "Ooze"

NameLevel
Black Pudding7
Blood Ooze4
Gelatinous Cube3
Ochre Jelly5
Sewer Ooze1

Ooze

Source Bestiary pg. 254
Slimes, molds, and other oozes can be found in dank dungeons and shadowed forests. While not necessarily evil, some grow to enormous sizes and have insatiable appetites.

Sidebar - Additional Lore Oozing Acid

Many oozes have acidic attacks that can quickly degrade flesh, wood, and even stronger materials. Some believe that oozes are the result of alchemical or magical experimentation run amok, while others postulate that they simply emerged from the natural processes of evolution.

Sidebar - Related Creatures Other Oozes

Many varieties of these nearly mindless predators exist in the world. Some are mere variants, with different colored puddings, jellies, and oozes with little to differentiate them from those presented here other than their habitat. Others are more specialized, or even dangerously intelligent. The shoggoth is one such example, but another variety of deadly and powerful ooze is the thankfully rare blight, a creature composed of protoplasm and eyes that curses entire regions with its presence.