Giant Octopus

Large beast, unaligned

Armor Class 11

Hit Points 52 (8d10+8)

Speed 10ft., swim 60ft.

Skills Perception +4, Stealth +5

Senses darkvision 60ft., passive Perception 14

Languages -

Challenge 1 (200 XP)

Traits

Hold Breath

While out of water, the octopus can hold its breath for 1 hour.

Underwater Camouflage

The octopus has advantage on Dexterity (Stealth) checks made while underwater.

Water Breathing

The octopus can breathe only underwater.

Actions

Tentacles

Melee Weapon Attack: +5 to hit, reach 15ft., one target.
Hit: 10 (2d6+3) bludgeoning damage. If the target is a creature, it is grappled (escape DC 16). Until this grapple ends, the target is restrained, and the octopus can't use its tentacles on another target.

Ink Cloud (Recharges after a Short or long rest)

A 20ft radius cloud of ink extends all around the octopus if it is underwater. The area is heavily obscured for 1 minute, although a significant current can disperse the ink. After releasing the ink, the octopus can use the Dash action as a bonus action.