Octopus

Small Beast, Unaligned

AC: 12

Initiative: +2 (12)

HP: 3 (1d6)

Speed: 5 ft., swim 30 ft.

STR
4 (-3)
DEX
15 (+2)
CON
11 (+0)
INT
3 (-4)
WIS
10 (+0)
CHA
4 (-3)

Skills: Perception +2, Stealth +6

Senses: Darkvision 30 ft., Passive Perception 12

CR: 0 (XP 10; PB +2)

Habitat: Underwater

Compression.

The octopus can move through a space as narrow as 1 inch without expending extra movement to do so.

Water Breathing.

The octopus can breathe only underwater.

Actions

Tentacles.

Melee Attack Roll: +4, reach 5 ft. Hit: 1 Bludgeoning damage.

Reactions

Ink Cloud (1/Day).

Trigger: A creature ends its turn within 5 feet of the octopus while underwater. Response: The octopus releases ink that fills a 5-foot Cube centered on itself, and the octopus moves up to its Swim Speed. The Cube is Heavily Obscured for 1 minute or until a strong current or similar effect disperses the ink.

Find this creature in the encounter builder

Octopus

Source: Monster Manual (2025), p. 365 - Licenses and attribution