Kryx RPGThemesMonsters

Gelatinous Cube

Large ooze
2 (450 XP)


Condition immunities blinded, charmed, deafened, exhausted, frightened, prone

Speed 4.5 m.
Senses blindsight 18 m. (blind beyond this radius)

Maneuvers. The gelatinous cube uses maneuvers (maneuver save DC 12). It has 7 stamina dice which are d8s, a dice limit of 1, regains all expended stamina dice when it finishes a long rest and regains half its total stamina dice (rounded up) when it finishes a short rest, and knows the following maneuvers:

1 stamina die: ambush, grapple, spring attack

Ooze Cube. The 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 1.5 meters 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.

Transparent. Even when the cube is in plain sight, it takes a successful DC 15 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.


Pseudopod. Melee Weapon Attack: +4 to hit, reach 1.5 m., one creature. Hit: 10 (3d6) acid damage.

Engulf. The 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 Reflex saving throw.

On a successful save, the creature can choose to be pushed 1.5 meters 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 1.5 meters of the cube.