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
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
Bull Shark 3 0 ft., swim 40 ft. Large monstrosity unaligned
Colossal Octopus 15 20 ft., swim 60 ft. Gargantuan beast unaligned
Deep Tentacle 1/8 5 ft., swim 40 ft. Medium undead unaligned
Dire Crab 3 30 ft., swim 30 ft. Large beast unaligned
Eel Hydra 12 30 ft., swim 40 ft. Huge monstrosity unaligned
Excremental 1/2 20 ft. Large elemental unaligned
Excremini 1/8 15 ft. Small elemental unaligned
Giant Eel 2 0 ft., swim 40 ft. Huge 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
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
Kikimora 2 30 ft., burrow 10 ft., climb 30 ft., swim 30 ft. Medium undead neutral evil
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 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
Necrofex Colossus 17 30 ft., swim 30 ft. Gargantuan construct neutral evil
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
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 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
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 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
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 Titan 21 50 ft., swim 50 ft. Gargantuan giant chaotic good
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
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
Wereshark 4 30 ft., swim 30 ft. (0 ft., swim 60 ft. in shark form) Medium humanoid neutral evil

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