5e Underwater Monsters

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Underwater Monsters, Quality and Featured[edit]

These monsters have been vetted through the Featured Articles or Quality Articles process and are suitable for any normal campaign.

Name CR Speed Size Type Alignment
Sea Serpent 18 30 ft., swim 80 ft. Gargantuan monstrosity neutral
Young Sea Serpent, Variant 8 30 ft., swim 60 ft. Huge monstrosity neutral


Underwater Monsters[edit]

Name CR Speed Size Type Alignment
Ammonite 0 0 ft., swim 20 ft. Tiny beast unaligned
Aqua Dragon 4 10 ft., fly 60 ft. (hover), swim 60 ft. Small dragon neutral good
Aquado 1/2 30 ft., swim 30 ft. Medium humanoid chaotic good
Aquado Mariner 7 30 ft., swim 30 ft. Medium humanoid chaotic good
Aquado Ocean Lord 11 30 ft., swim 30 ft. Medium humanoid chaotic good
Aquado Protector 6 30 ft., swim 30 ft. Medium humanoid chaotic good
Aquado Sea Warden 11 30 ft., swim 30 ft. Medium humanoid chaotic good
Bellowshell 2 20 ft., swim 20 ft. Large monstrosity unaligned
Blackwater Mephit 1/4 30 ft. Small elemental neutral evil
Bloated Zombie 1 20 ft. Medium undead chaotic evil
Bloody-Ribboned One 10 30 ft., swim 45 ft. Medium monstrosity lawful evil
Blue Whale 10 0 ft., swim 120 ft. Gargantuan beast unaligned
Brute Zombie 1 20 ft. Medium undead chaotic evil
Bull Shark 3 0 ft., swim 40 ft. Large monstrosity unaligned
Burrowing Slitherfang 1/2 10 ft., burrow 10 ft. Small dragon unaligned
Colossal Octopus 15 20 ft., swim 60 ft. Gargantuan beast unaligned
Deep One 1 30 ft., swim 40 ft. Medium monstrosity neutral evil
Deep Tentacle 1/8 5 ft., swim 40 ft. Medium undead unaligned
Depth Giant 9 30 ft., swim 60 ft. Huge giant neutral
Depth Giant Trench Walker 15 40 ft., swim 90 ft. Huge giant neutral
Desbreko 7 0 ft., swim 35 ft. Medium undead chaotic evil
Dire Crab 3 30 ft., swim 30 ft. Large beast unaligned
Dracohybrid Wrecker 12 40 ft., swim 80 ft. Huge monstrosity unaligned
Dripper Zombie 1 20 ft. Medium undead chaotic evil
Dunkleosteus 4 0 ft., swim 20 ft. Huge beast unaligned
Eel Hydra 12 30 ft., swim 40 ft. Huge monstrosity unaligned
Ekhidna 3 10 ft., fly 50 ft., swim 50 ft. Large monstrosity chaotic evil
Eurypterid 5 15 ft., swim 15 ft. Large beast unaligned
Excremental 1/2 20 ft. Large elemental unaligned
Excremini 1/8 15 ft. Small elemental unaligned
Experimental Zombie 3 45 ft. Medium undead chaotic evil
Eye of the Deep 7 0 ft., swim 20 ft. Small aberration lawful evil
Flamer Zombie 1 20 ft. Medium undead chaotic evil
Floater Zombie 1 0 ft., swim 20 ft. Medium undead chaotic evil
Foulmonella 3 10 ft., swim 30 ft. Small plant unaligned
Funkwe 17 10 ft., burrow 20 ft., swim 60 ft. Gargantuan dragon neutral evil
Giant Ammonite 2 0 ft., swim 20 ft. Large beast unaligned
Giant Eel 2 0 ft., swim 40 ft. Huge beast unaligned
Giant Hagfish 1/4 0 ft., swim 30 ft. Medium beast unaligned
Giant Slug 1/2 20 ft. Medium beast unaligned
Grand Sea Drake 11 20 ft., fly 60 ft., swim 60 ft. Huge dragon unaligned
Great Water Elemental 8 30 ft., swim 90 ft. Large elemental neutral
Gyorg 9 0 ft., swim 40 ft. Large monstrosity neutral evil
Hippocampus 2 20 ft., swim 90 ft. Large monstrosity chaotic good
Ichthyosaurus 2 5 ft., swim 50 ft. Medium beast unaligned
Jolly Roger 2 25 ft., swim 30 ft. Medium undead chaotic evil
Juvenile Reaper Leviathan 7 0 ft., swim 40 ft. Large monstrosity unaligned
Kikimora 2 30 ft., burrow 10 ft., climb 30 ft., swim 30 ft. Medium undead neutral evil
Kronosaurus 7 0 ft., swim 60 ft. Huge beast unaligned
Kurajaku 13 25 ft. (40 ft. while underwater), swim 15 ft. Huge beast unaligned
Lord of the Coast (Grand Line Supplement) 4 80 Swimming Speed Large beast chaotic neutral
Marple 0 5 ft., fly 15 ft., swim 15 ft. Tiny fey neutral
Marshtomp 4 35 ft. Medium beast lawful good
Medusozoan 2 0 ft., swim 25 ft. Large monstrosity unaligned
Merfolk Hoplite 7 10 ft., swim 40 ft. Medium humanoid neutral
Merfolk Hunter 1 10 ft., swim 40 ft. Medium humanoid neutral
Merfolk Knight 1 30 ft., swim 40 ft. Medium humanoid lawful good
Merfolk Pikeman 1 10 ft., swim 40 ft. Medium humanoid neutral
Merfolk Seasage 1 10 ft. (20 ft. with longstrider), swim 40 ft. Medium humanoid neutral
Merfolk Stormbrewer 6 10 ft., fly 20 ft., swim 40 ft. Medium humanoid neutral
Merwyrm 7 30 ft., swim 60 ft. Large dragon chaotic evil
Metalhead Zombie 1 20 ft. Medium undead chaotic evil
Milaq 5 15 ft., swim 45 ft. Large monstrosity chaotic evil
Motomazor 17 0 ft., swim 80 ft. Gargantuan beast unaligned
Mudkip 1 30 ft. Small beast lawful good
Necrofex Colossus 17 30 ft., swim 30 ft. Gargantuan construct neutral evil
Nymphernal 4 30 ft., swim 30 ft. Medium monstrosity unaligned
Ochaun 5 20 ft., swim 40 ft. Large giant neutral
Octofolk 1/2 20 ft., swim 30 ft. Medium humanoid lawful neutral
Octofolk Entangler 3 20 ft., swim 30 ft. Medium humanoid lawful neutral
Octohulk 4 20 ft., swim 30 ft. Large monstrosity lawful evil
Ophthalmosaurus 2 5 ft., swim 45 ft. Medium beast unaligned
Pearl Giant 9 40 ft., swim 40 ft. Huge giant any lawful alignment
Pearl Titan 18 40 ft., swim 40 ft. Gargantuan giant any lawful alignment
Porcupine Zombie 2 20 ft. Medium undead chaotic evil
Psychic Zombie 6 20 ft. Medium undead chaotic evil
Runner Zombie 1 40 ft. Medium undead chaotic evil
Screamer Zombie 2 20 ft. Medium undead chaotic evil
Sea Dog 1/4 20 ft., swim 40 ft. Medium beast unaligned
Sea Drake 8 20 ft., fly 60 ft., swim 60 ft. Large dragon unaligned
Sea Monkey 1/8 20 ft., swim 40 ft. Small beast unaligned
Sea Orc 1/2 30 ft., swim 30 ft. Medium humanoid chaotic evil
Sea Slime 2 10 ft., climb 10 ft., swim 20 ft. Medium ooze unaligned
Shadow Elemental 5 0 ft., fly 60 ft. (hover) Large elemental chaotic neutral
Shapeless 1/4 30 ft., swim 30 ft. (30 ft., swim 60 ft. in shapeless form) Medium elemental neutral
Shapeless Assassin 1/2 30 ft., swim 30 ft. (30 ft., swim 60 ft. in shapeless form) Medium elemental neutral
Shapeless Fighter 1/2 30 ft., swim 30 ft. (30 ft., swim 60 ft. in shapeless form) Medium elemental neutral
Shapeless Giant 5 30 ft., swim 30 ft. (40 ft., swim 80 ft. in shapeless form) Large elemental neutral
Shapeless Mage 1/2 30 ft., swim 30 ft. (30 ft., swim 60 ft. in shapeless form) Medium elemental neutral
Shapeless Ranger 1/2 30 ft., swim 30 ft. (30 ft., swim 60 ft. in shapeless form) Medium elemental neutral
Shoggoth 13 30 ft., swim 30 ft. Huge aberration chaotic neutral
Skullfish 4 0 ft., swim 40 ft. Small undead chaotic evil
Spitter Zombie 2 20 ft. Medium undead chaotic evil
Stonefin 6 0 ft., burrow 40 ft., swim 40 ft. Large elemental neutral
Storm Giant Skeleton 11 50 ft., swim 50 ft. Huge undead lawful evil
Storm Giant Soothsayer 18 50 ft., swim 50 ft. Huge giant chaotic good
Storm Titan 21 50 ft., swim 50 ft. Gargantuan giant chaotic good
Swarm of Bioluminescent Plankton 0 0 ft., swim 5 ft. Medium beast unaligned
Tideborn 1 30 ft., swim 30 ft. Medium humanoid neutral evil
Tideborn Exalted 14 30 ft., swim 60 ft. Medium elemental neutral evil
Tideborn Maelstrom 5 30 ft., swim 30 ft. Medium humanoid neutral evil
Turtlefolk 1 20 ft., swim 40 ft. Medium humanoid neutral
Undead Whale 10 5 ft., swim 50 ft. Gargantuan undead neutral evil
Undertow Stalker 7 5 ft., swim 40 ft. Large monstrosity neutral
Verucka 4 5 ft., swim 60 ft. Huge monstrosity chaotic evil
Wardolphin 2 0 ft., swim 40 ft. Medium beast neutral
Wereshark 4 30 ft., swim 30 ft. (0 ft., swim 60 ft. in shark form) Medium humanoid neutral evil
Whale Zombie 4 0 ft., swim 50 ft. Huge undead neutral evil
Zipping Turtle 1 70 ft., climb 70 ft., swim 70 ft. Small monstrosity unaligned
Zombie Leader 3 30 ft. Medium undead chaotic evil
Zombie, Variant 1 20 ft. Medium undead chaotic evil

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