Corridor Gelatinous Cube

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Large Ooze (amorphous), Neutral

Armor Class 12

Hit Points 84 (12d10+24)

Speed 30 ft.

STR 16 (+3)

DEX 1 (-5)

CON 14 (+2)

INT 1 (-5)

WIS 1 (-5)

CHA 1 (-5)

Saving Throws Con +5

Damage Vulnerabilities fire

Damage Resistances slashing; piercing

Damage Immunities poison, psychic

Condition Immunities blinded, charmed, deafened, frightened, grappled, paralyzed, petrified, poisoned

Senses blindsight 60 ft.

Languages —

Challenge 5 (1,800 XP) Proficiency Bonus +3

Amorphous. The cube can move through a space as narrow as 1 inch wide without squeezing.

Corrosive Form. Any creature that touches the cube or hits it with a melee attack takes 7 (2d6) acid damage.

Engulf. The cube can attempt to engulf a creature that is within 5 feet of it. The target must make a DC 15 Dexterity saving throw. On a failed save, the target is engulfed, taking 21 (6d6) acid damage at the start of each of its turns and is blinded and restrained for as long as it remains inside the cube.

Actions

Multiattack. The cube makes one engulf attack and one slam attack.

Slam. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8+4) bludgeoning damage.

Engulf. The cube engulfs a creature within 5 feet of it. The target must succeed on a DC 15 Dexterity saving throw or take 21 (6d6) acid damage and be engulfed.

Environment Urban, Underdark

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Lore & Description

Appearance

This massive gelatinous cube is a translucent mass of squelching goo, shimmering in hues of green and blue. Its surface is constantly shifting, with trapped debris and unlucky creatures visible within. Its presence in a corridor is often fatal to those who are unaware of its nature.

Behavior & Origins

These gelatinous cubes patrol narrow passageways, occupying space in dungeons and caves. They are instinctive hunters that lack higher intelligence but excel at ambushing intruders. They feed on organic matter, digesting anything they trap in their corrosive embrace.

Monster Image

Generation Info

Original prompt:
"A gelatinous cube that fills corridors"

Created: Jan 28, 2026
Modified: May 31, 2026