Gelatinous CubeCR 2 · Large Ooze · Stat Block & Encounter Builder

Large ooze, Challenge 2. AC 6, 84 hit points.

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Armour Class

Hit Points

Speed

15 ft.

Challenge

2 · 450 XP

Alignment

Unaligned

The card

Stat Block

Large Ooze · Unaligned

Gelatinous Cube

8d10 + 40 · 15 ft.

Blindsight 60 ft. (blind beyond this radius), passive Perception 8

Languages: —

STR	DEX	CON	INT	WIS	CHA
14 (+2)	3 (-4)	20 (+5)	1 (-5)	6 (-2)	1 (-5)

Traits

Condition ImmunitiesBlinded, Charmed, Deafened, Exhaustion, Frightened, Prone

Ooze CubeThe cube takes up its entire space. Other creatures can enter the space, but a creature that does so is subjected to the cube's Engulf and has disadvantage on the saving throw. Creatures inside the cube can be seen but have total cover. A creature within 5 feet of the cube can take an action to pull a creature or object out of the cube. Doing so requires a successful DC 12 Strength check, and the creature making the attempt takes 10 (3d6) acid damage. The cube can hold only one Large creature or up to four Medium or smaller creatures inside it at a time.

TransparentEven when the cube is in plain sight, it takes a successful DC 15 Wisdom (Perception) check to spot a cube that has neither moved nor attacked. A creature that tries to enter the cube's space while unaware of the cube is surprised by the cube.

Actions

PseudopodMelee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) acid damage.

EngulfThe cube moves up to its speed. While doing so, it can enter Large or smaller creatures' spaces. Whenever the cube enters a creature's space, the creature must make a DC 12 Dexterity saving throw. On a successful save, the creature can choose to be pushed 5 feet back or to the side of the cube. A creature that chooses not to be pushed suffers the consequences of a failed saving throw. On a failed save, the cube enters the creature's space, and the creature takes 10 (3d6) acid damage and is engulfed. The engulfed creature can't breathe, is restrained, and takes 21 (6d6) acid damage at the start of each of the cube's turns. When the cube moves, the engulfed creature moves with it. An engulfed creature can try to escape by taking an action to make a DC 12 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the cube.

How to actually run it

Tactics

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Encounter Difficulty

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How bad is this fight?

Real DMG maths — XP thresholds by level, and the group multiplier that makes crowds so much worse than the raw total suggests.

Gelatinous Cubes4Party size4Party level3

Could kill someone — and at high enough numbers, the whole party.

Difficulty

Deadly

3,600 adj. XP · ×2

deadly at 1,600

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Counsel

Gelatinous Cube, Answered

What is Gelatinous Cube's challenge rating in D&D 5e?

Gelatinous Cube is Challenge 2, worth 450 XP. Encounter maths multiplies XP by the number of monsters, so a group is deadlier than the raw total — use the calculator on this page.

What are Gelatinous Cube's stats?

AC 6, 84 hit points (8d10 + 40), speed 15 ft.. Ability scores: STR 14, DEX 3, CON 20, INT 1, WIS 6, CHA 1.

Where does Gelatinous Cube fit in an encounter?

As a ooze of Challenge 2, it suits a party whose level is in the same range. Adjust party size and level in the builder above to see the difficulty shift live.

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