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
Aberrant Demagogue 10 10 ft. Large aberration lawful evil
Adult Pink Dragon 15 40 ft., fly 80 ft., swim 40 ft. Huge dragon lawful evil
Ammonite 0 0 ft., swim 20 ft. Tiny beast unaligned
Angler Crab 13 40 ft., swim 20 ft. Gargantuan 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
Atopodentatus 1 25 ft., swim 50 ft. Medium beast unaligned
Auroral Megalops 10 40 ft., swim 20 ft. Huge beast unaligned
Bellowshell 2 20 ft., swim 20 ft. Large monstrosity unaligned
Benthid 6 10 ft., swim 60 ft. Large beast neutral
Big Octo 6 40 ft., burrow 10 ft., swim 40 ft. Large beast unaligned
Black Carpet 30 20 ft., climb 20 ft., swim 20 ft. Titanic ooze 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
Bog Wader 3 30 ft., burrow 30 ft., swim 30 ft. Medium humanoid chaotic neutral
Brine Zombie 1/2 20 ft., swim 20 ft. Medium undead neutral evil
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
Cachalot 16 0 ft., swim 50 ft. Gargantuan beast unaligned
Cavern Lamprey 2 10 ft., climb 10 ft., swim 10 ft. Huge beast unaligned
Colossal Octopus 15 20 ft., swim 60 ft. Gargantuan beast unaligned
Con Rit 15 5 ft., swim 50 ft. Gargantuan monstrosity unaligned
Cursed Gator Guardian 15 20 ft., climb 15 ft., swim 60 ft. Huge undead neutral evil
Deep One 1 30 ft., swim 40 ft. Medium monstrosity neutral evil
Deep One Behemoth 9 30 ft., swim 40 ft. Huge monstrosity neutral evil
Deep One Hybrid 1/2 30 ft., swim 20 ft. Medium humanoid neutral evil
Deep One Priest of Dagon 4 30 ft., swim 40 ft. Medium monstrosity neutral evil
Deep Python 4 20 ft., swim 80 ft., burrow 20 ft. Gargantuan monstrosity unaligned
Deep Tentacle 1/8 5 ft., swim 40 ft. Medium undead unaligned
DeepWave Drake 18 40 ft., fly 40 ft., swim 80 ft. Huge dragon neutral
DeepWave Dredger 1/2 5 ft. Medium beast unaligned
DeepWave Floater 0 0 ft., swim 10 ft. Tiny beast unaligned
DeepWave Glider 7 0 ft., swim 60 ft. Huge beast unaligned
DeepWave Ice Golem 4 30 ft. Large construct neutral
DeepWave Maw 4 30 ft., burrow 20 ft. Huge beast unaligned
DeepWave Shrieker 1/4 5 ft. Small beast unaligned
DeepWave Skimmer 1/2 0 ft., swim 30 ft. Large beast unaligned
DeepWave Snare 1/4 0 ft. Medium plant unaligned
DeepWave Stalker 3 10 ft., swim 35 ft. Medium beast unaligned
DeepWave Strider 1/2 35 ft. Large beast 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
Drowner 1 35 ft., swim 35 ft. Medium undead chaotic evil
Dunkleosteus 4 0 ft., swim 20 ft. Huge beast unaligned
Eel Hound 2 60 ft., swim 40 ft. Large 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
Electroscale Eel 3 0 ft., swim 40 ft. Small beast unaligned
Esquidna 20 25 ft., swim 60 ft. Gargantuan 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 Colony 0 0 ft., swim 10 ft. Gargantuan beast unaligned
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
Geozard 1/2 30 ft., swim 50 ft. Medium humanoid any alignment
Giant Ammonite 2 0 ft., swim 20 ft. Large beast unaligned
Giant Brittle Star 3 10 ft., swim 10 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 Octopus, Variant 2 15 ft., climb 15 ft., swim 60 ft. Large beast unaligned
Giant Shallow Wave Stalker 3 25 ft., swim 50 ft. Large beast unaligned
Giant Slug 1/2 20 ft. Medium beast unaligned
Giant Starfish 5 5 ft. Large 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
Hagonizer 5 20 ft., swim 40 ft. Medium monstrosity unaligned
Hippocampus 2 20 ft., swim 90 ft. Large monstrosity chaotic good
Horned Hulk 7 40 ft., burrow 10 ft. Large monstrosity chaotic evil
Ichthyosaurus 2 0 ft., swim 50 ft. Medium beast unaligned
Ignifish 1/4 0 ft., swim 30 ft. Tiny beast unaligned
Ingkludd 0 0 ft. Small monstrosity 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
Kelpie 2 25 ft., swim 30 ft. Medium plant chaotic evil
Kikimora 2 30 ft., burrow 10 ft., climb 30 ft., swim 30 ft. Medium undead neutral evil
Krakentua 24 40 ft., swim 30 ft. Gargantuan aberration 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
Lagiacrus 22 40 ft., swim 90 ft. Gargantuan beast neutral
Lava Snail 3 15 ft., swim 30 ft. Large beast neutral
Like Like 5 20 ft. Large ooze unaligned
Liopluerodon 10 0 ft., swim 90 ft. Huge beast unaligned
Loch Ness Monster 8 20 ft., swim 50 ft. Huge beast unaligned
Lorn-Fluke 13 10 ft., swim 50 ft. Gargantuan aberration chaotic evil
Lornest-Fluke 11 10 ft., swim 50 ft. Gargantuan aberration chaotic evil
Mackralich 1/2 0 ft., swim 40 ft. Medium undead unaligned
Magma Dweller 18 40 ft., burrow 20 ft., swim 40 ft. Huge elemental chaotic neutral
Manatee 1/2 0 ft., swim 30 ft. Large beast unaligned
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
Megalodon 10 0 ft., swim 50 ft. Gargantuan beast 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
Mosasaur 14 0 ft., swim 60 ft. Gargantuan beast unaligned
Motomazor 17 0 ft., swim 80 ft. Gargantuan beast unaligned
Mudkip 1 30 ft. Small beast lawful good
Murk Elemental 5 30 ft., swim 40 ft. Large elemental chaotic neutral
Murloc 1/4 25 ft., swim 30 ft. Small humanoid chaotic neutral
Murloc Murk-Mage 1/2 25 ft., swim 30 ft. Small humanoid chaotic neutral
Necrofex Colossus 17 30 ft., swim 30 ft. Gargantuan construct neutral evil
Nekronaut 2 30 ft. Small undead lawful neutral
Neptune's Harlot 6 30 ft., swim 30 ft. Large beast unaligned
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
Octorok 1/4 30 ft., swim 30 ft. Medium beast unaligned
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
Pliosaurus 10 0 ft., swim 90 ft. Gargantuan beast unaligned
Poolhusk 2 30 ft., swim 35 ft. Medium undead neutral evil
Poolhusk Frostborn 8 30 ft., swim 50 ft. Medium undead neutral evil
Porcupine Zombie 2 20 ft. Medium undead chaotic evil
Porpoise 1/4 5 ft., swim 50 ft. Medium beast unaligned
Psychic Zombie 6 20 ft. Medium undead chaotic evil
Quill Scarab 1/4 20 ft., climb 20 ft., swim 20 ft. Small beast unaligned
Renzhuyo 5 15 ft., swim 25 ft. Large beast unaligned
River Zora 1/4 30 ft., swim 50 ft. Medium humanoid any alignment
Rubbery Man 1 30 ft. Medium aberration any neutral alignment
Runner Zombie 1 40 ft. Medium undead chaotic evil
Scorn-Fluke 17 10 ft., swim 50 ft. Gargantuan aberration 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
Sea Turtle 1/8 5 ft., swim 40 ft. Medium beast unaligned
Sea Urchin 0 5 ft., swim 10 ft. Tiny beast unaligned
Seahat 3 5 ft., fly 40 ft. (hover), swim 10 ft. Huge plant unaligned
Shadow Elemental 5 0 ft., fly 60 ft. (hover) Large elemental chaotic neutral
Shallow Wave Stalker 1/8 10 ft., swim 35 ft. Medium beast unaligned
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
Shimmerfish 1/2 0 ft., swim 60 ft. Medium monstrosity chaotic evil
Shockscale Perch 1/4 0 ft., swim 30 ft. Tiny beast unaligned
Shoggoth 13 30 ft., swim 30 ft. Huge aberration chaotic neutral
Singing Whale 6 0 ft., swim 50 ft. Gargantuan beast neutral good
Skullfish 4 0 ft., swim 40 ft. Small undead chaotic evil
Somnambulist 5 30 ft., swim 40 ft. Medium undead neutral evil
Sonic Springtail 1/2 0 ft., swim 35 ft. Small beast unaligned
Spitter Zombie 2 20 ft. Medium undead chaotic evil
Star Spawn of Cthulhu 18 40 ft., fly 60 ft., swim 60 ft. Huge aberration 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
Swarm of Shadowcrabs 1/4 20 ft., climb 20 ft., swim 20 ft. Medium undead unaligned
Thermovile Queen 15 40 ft. climb 30 ft. Huge monstrosity unaligned
Tide Ruler 18 60 ft., swim 60 ft. Gargantuan elemental neutral
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
Tylosaurus 14 0 ft., swim 60 ft. Large beast unaligned
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
Wasgo 14 40 ft., swim 60 ft. Gargantuan monstrosity unaligned
Wereoctopus 2 30 ft. (15 ft., swim 60 ft. in octopus or hybrid form) Medium humanoid neutral evil
Wereshark 4 30 ft., swim 30 ft. (0 ft., swim 60 ft. in shark form) Medium humanoid neutral evil
Whale Pishacha 13 20 ft., swim 200 ft. Gargantuan fiend unaligned
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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