Gelatinous Cube

Gelatinous Cube CR: 2 (450 XP)

Large ooze, unaligned

Armor Class: 6

Hit Points: 84 ( 8d10+40 )

Speed: 15 ft

STR

14 +2

DEX

3 -4

CON

20 +5

INT

1 -5

WIS

6 -2

CHA

1 -5

Condition Immunities: Blinded, Charmed, Deafened, Exhaustion, Frightened, Prone

Senses: Blindsight 60 ft. (blind beyond this radius), Passive Perception 8

Languages: --

Challenge Rating: 2 (450 XP)

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 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.
Transparent. Even 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

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., 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 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.

Gelatinous Cubes are creatures usually found in crumbling old ruins, and in the Underdark. They pretty much attack any living creature digesting the soft organic tissue, by slipping up to it near unseen in the dark, and sucking it into itself. The body of the gelatinous cube is translucent and remaining body parts, equipment and items can still be seen inside it. Because of the body of it is a form of ooze, it makes no noise so it can come as a shock to most when it attacks.

Suggested Environments

Dungeons, caves, ruins.