Medium aberration, chaotic neutral

Armor Class: 18 (natural armor)

Hit Points: 180 (19d10 + 76) 19d10+76

Speed: 0 ft , fly: 20 ft , swim: 30 ft

STR

10 +0

DEX

14 +2

CON

18 +4

INT

17 +3

WIS

15 +2

CHA

17 +3

Saving Throws: All +3

Skills: Perception +7

Damage Immunities: prone

Senses: darkvision 120 ft., passive Perception 17

Languages: Aquan, Deep Speech

Challenge Rating: 5 (1,800 XP)

Actions

Multiattack. The eye of the deep makes two pincer attacks. If the eye of the deep is grappling a creature, the eye of the deep can also use its bite once.   Pincer. Melee Weapon Attack: +5 1d20+5 to hit, reach 5 ft., one target. Hit: 7 (2d6) 2d6 bludgeoning damage. The target is grappled (escape DC 16) if it is a Large or smaller creature and the eye of the deep doesn't have two other creatures grappled. Grappled targets automatically take 17 bludgeoning damage at the start of their turn.   Bite. Melee Weapon Attack: +5 1d20+5 to hit, reach 5 ft., one target. Hit: 14 (4d6) 4d6 piercing damage.     Eye Rays. Each of the creature’s eyes stalks can produce a magical ray once per round. The creature can aim both of its eye rays in any direction, and they have a range of 150 feet. Eyes maybe combined for different effects:

• Paralytic Flash (Central, Recharge). Its central eye gives off a light flash from its central eye. Anyone who can see the flash (up to 30 feet) must make a Wisdom saving throw or be paralyzed for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
• Hold Person (Left). The target humanoid is held, as the spell. However, if the target is already stunned it instead becomes enfeebled on a failed CON saving throw and deal half damage with all attacks that use STR, DEX or CON for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
• Hold Monster (Right). The target creature is held, as the spell. However, if the target is already stunned it instead becomes enfeebled on a failed CON saving throw and deal half damage with all attacks that use STR, DEX or CON for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
• Major Image (Both Eye Stalks). The eye of the deep concentrates its eye rays together to project a major image illusion. The illusion is generated at any point within range and in the eye of the deep’s line of sight. Seeing through the illusion requires a successful DC 15 Intelligence (Investigation) check.

Reactions

Ink Cloud (Recharges after a Short or Long Rest). A 20- foot-radius cloud of ink extends all around the monitor – he does not need to be underwater for this to work. The area is heavily obscured for 1 minute, although a significant current or breeze can disperse the ink. After releasing the ink, the octopus can use the Dash action as a bonus action.

Legendary Actions

Legendary (x1 if 4+ PCs/Henchmen, x2 if 6+ PCs/Henchmen, x3 if 8+ PCs/Henchmen) • Eye Rays. Uses a random eye ray. • Snap! Uses a claw attack.

Suggested Environments

Aquatic, Ocean, Sea, Underwater