Giant Octopus

Source: Monster Manual p. 326. Available in the SRD and the Basic Rules (2014)

"name": "Giant Octopus"
"size": "Large"
"type": "beast"
"alignment": "Unaligned"
"ac": !!int "11"
"hp": !!int "52"
"hit_dice": "8d10 + 8"
"modifier": !!int "1"
"stats":
  - !!int "17"
  - !!int "13"
  - !!int "13"
  - !!int "4"
  - !!int "10"
  - !!int "4"
"speed": "10 ft., swim 60 ft."
"skillsaves":
  - "name": "Perception"
    "desc": "+4"
  - "name": "Stealth"
    "desc": "+5"
"senses": "darkvision 60 ft., passive Perception 14"
"languages": ""
"cr": "1"
"traits":
  - "desc": "While out of water, the octopus can hold its breath for 1 hour."
    "name": "Hold Breath"
  - "desc": "The octopus has advantage on Dexterity (Stealth) checks made while underwater."
    "name": "Underwater Camouflage"
  - "desc": "The octopus can breathe only underwater."
    "name": "Water Breathing"
"actions":
  - "desc": "*Melee Weapon Attack:* +5 to hit, reach 15 ft., 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."
    "name": "Tentacles"
  - "desc": "A 20-foot-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."
    "name": "Ink Cloud (Recharges after a Short or Long Rest)"
"source":
  - "MM"
"image": "/3-Mechanics/CLI/bestiary/beast/token/giant-octopus.webp"

Environment

underwater