Habitat (5e)/Underwater

 5th edition Varied 
See Sources and Notes

Underwater Creatures

(81 official and unofficial monsters)

Name	Habitat	Type	Subtype	Size	HP	CR	XP	Alignment	Source
Plesiosaurus	Coastal, Underwater	Beast	Dinosaur	Large	68	2	450	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Killer Whale	Underwater	Beast	Whale	Huge	90	3	700	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Kraken	Underwater	Overview	Monstrosity, Titan, Kraken						SRD5, MM5, MOoT
Wastrilith	Coastal, Swamp, Underdark, Underground, Underwater	Fiend	Demon	Large	157	13	10,000	Chaotic Evil	Monsters of the Multiverse
Nightsea Chil-liren	Coastal, Underwater	Humanoid		Medium	11	1/8	25	Neutral	Journeys through the Radiant Citadel
Marid	Coastal, Underwater	Elemental	Genie, Water Elemental	Large	229	11	7,200	Chaotic Neutral	Monster Manual (5e)
Constrictor Snake	Desert, Forest, Swamp, Underwater	Beast	Snake	Large	13	1/4	50	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Ixitxachitl Cleric	Coastal, Underwater	Aberration	Ixitxachitl, Cleric	Small	18	1/4	50	Chaotic Evil	Out of the Abyss
Koalinth Sergeant	Coastal, Underwater	Humanoid	Goblinoid, Hobgoblin, Koalinth	Medium	33	2	450	Lawful Evil	Ghosts of Saltmarsh
Sgothgah	Underdark, Underground, Underwater	Aberration	Aboleth	Large	135	10	5,900	Lawful Evil	GoS, SRD5
Sea Horse	Underwater	Beast	Sea Horse	Tiny	1	0	0	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Giant Lightning Eel	Coastal, Underwater	Beast	Eel	Large	42	3	700	Unaligned	Tales from the Yawning Portal
Deep Scion	Coastal, Underwater	Humanoid	Shapechanger	Medium	67	3	700	Neutral Evil	VGtM, MotM, Varied
Naiad	Coastal, Feywild, Underwater	Fey	Nymph	Medium	31	2	450	Chaotic Neutral	Mythic Odysseys of Theros
Dragon Turtle Wyrmling	Coastal, Underwater	Dragon	Dragon Turtle	Large	90	4	1,100	Neutral	Fizban's Treasury of Dragons
Quipper	Underwater	Beast	Quipper	Large	1	0	10	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Deva	Arctic, Coastal, Desert, Feywild, Forest, Grassland, Hill, Mountain, Shadowfell, Swamp, Underground, Underwater	Celestial	Angel	Medium	136	10	5,900	Lawful Good	SRD-CC v5.1, SRD-OGL v5.1
Juvenile Kraken	Underwater	Monstrosity	Titan, Kraken	Huge	207	14	11,500	Chaotic Evil	Ghosts of Saltmarsh
Aboleth	Underdark, Underground, Underwater	Aberration		Large	135	10	5,900	Lawful Evil	SRD-CC v5.1, SRD-OGL v5.1
Scrag	Coastal, Underwater	Giant	Troll	Large	84	5	1,800	Chaotic Evil	The Rise of Tiamat
Steam Mephit	Underwater	Elemental	Mephit	Small	21	1/4	50	Neutral Evil	SRD-CC v5.1, SRD-OGL v5.1
Giant Constrictor Snake	Desert, Forest, Swamp, Underdark, Underground, Underwater	Beast	Snake	Huge	60	2	450	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Vampiric Ixitxachitl	Coastal, Underwater	Aberration	Ixitxachitl	Medium	44	2	450	Chaotic Evil	Out of the Abyss
Kraken Priest	Coastal, Underwater	Humanoid	any race	Medium	75	5	1,800	any evil alignment	Volo's Guide to Monsters
Deep Lacedon	Coastal, Shadowfell, Underwater	Undead	Ghoul, Ghast, Lacedon	Medium	36	2	450	Chaotic Evil	SRD5, QftIS
Giant Sea Horse	Underwater	Beast	Sea Horse	Large	16	1/2	100	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Giant Sea Eel	Underwater	Beast	Eel	Large	19	1/2	100	Unaligned	Ghosts of Saltmarsh
Dolphin Common	Coastal, Underwater	Beast	Dolphin	Medium	11	1/8	25	Unaligned	Varied, VGtM, MotM
Skum	Coastal, Underdark, Underground, Underwater, Urban	Aberration		Medium	93	5	1,800	Lawful Evil	Ghosts of Saltmarsh
Water Elemental	Coastal, Swamp, Underwater	Elemental	Water Elemental	Large	114	5	1,800	Neutral	SRD-CC v5.1, SRD-OGL v5.1
Swarm of Quippers	Underwater	Swarm	Beast, Quipper	Medium	28	1	200	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Anvilwrought Raptor	Arctic, Coastal, Desert, Forest, Grassland, Hill, Mountain, Swamp, Underground, Underwater, Urban	Construct	Anvilwrought	Tiny	18	1/2	100	Unaligned	Mythic Odysseys of Theros
Malformed Kraken	Coastal, Underwater	Monstrosity	Titan, Kraken	Huge	172	10	5,900	Chaotic Evil	Tales from the Yawning Portal
Kysh	Underwater	Humanoid	Triton	Medium	27	1	200	Lawful Good, Lawful Evil	Ghosts of Saltmarsh
Giant Rocktopus	Underground, Underwater	Beast	Octopus	Large	52	1	200	Unaligned	Out of the Abyss
Merfolk	Coastal, Underwater	Humanoid	Merfolk	Medium	11	1/8	25	Neutral	SRD-CC v5.1, SRD-OGL v5.1
Sahuagin	Coastal, Underwater	Overview	Humanoid, Sahuagin						SRD5, MM5
Vampiric Ixitxachitl Cleric	Coastal, Underwater	Aberration	Ixitxachitl, Cleric	Medium		2	450	Chaotic Evil	Out of the Abyss
Leviathan	Coastal, Underwater	Elemental	Water Elemental, Elder Elemental	Gargantuan	328	20	25,000	Neutral	Mordenkainen's Tome of Foes
Lacedon	Coastal, Shadowfell, Underwater	Undead	Ghoul, Lacedon	Medium	22	1	200	Chaotic Evil	Rlyehable
Hunter Shark	Underwater	Beast	Shark	Large	45	2	450	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Hippocamp	Coastal, Underwater	Monstrosity		Large	22	1/2	100	Chaotic Good	Mythic Odysseys of Theros
Dolphin Delighter	Coastal, Underwater	Fey	Dolphin	Medium	27	3	700	Unaligned	Monsters of the Multiverse
Aryn	Coastal, Underwater	Humanoid	Merfolk, Merfolk Salvager	Medium	22	1	200	Neutral	Ghosts of Saltmarsh
Storm Giant	Coastal, Underwater	Giant	Storm Giant	Huge	230	13	10,000	Chaotic Good	SRD-CC v5.1, SRD-OGL v5.1
Sahuagin	Coastal, Underwater	Humanoid	Sahuagin	Medium	22	1/2	100	Lawful Evil	SRD-CC v5.1, SRD-OGL v5.1
Marine Decapus	Coastal, Underwater	Monstrosity	Decapus	Large	75	4	1,100	Unaligned	Tortle Package
Triton Common	Underwater	Humanoid	Triton	Medium	27	1	200	Lawful Good	Ghosts of Saltmarsh
Sea Monkey	Coastal, Underwater	Beast	Monkey	Small	2	1/8	25	Unaligned	Rlyehable
Dragon Turtle	Coastal, Underwater	Dragon	Dragon Turtle	Gargantuan	341	17	18,000	Neutral	SRD-CC v5.1, SRD-OGL v5.1
Octopus	Coastal, Underwater	Beast	Octopus	Small	3	0	10	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Merrow	Coastal, Underwater	Monstrosity	Merrow	Large	45	2	450	Chaotic Evil	SRD-CC v5.1, SRD-OGL v5.1
Shark	Underwater	Overview	Beast, Shark						Varied
Kelpie	Coastal, Underwater	Plant		Medium	67	4	1,100	Neutral Evil	Tales from the Yawning Portal
Morkoth	Coastal, Underwater	Aberration		Medium	130	11, 12	7,200	any alignment	Volo's Guide to Monsters
Mud Elemental	Coastal, Swamp, Underwater	Elemental	Mud Elemental	Large	114	5	1,800	Neutral	Quests from the Infinite Staircase
Sea Hag	Coastal, Underwater, Feywild	Fey	Hag	Medium	52	2	450	Chaotic Evil	SRD5, MM5
Reef Shark	Underwater	Beast	Shark	Medium	22	1/2	100	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Ixitxachitl	Coastal, Underwater	Overview	Aberration, Ixitxachitl						Out of the Abyss
Hydroloth	Costal, Swamp, Underwater	Fiend	Yugoloth	Medium	135	9	5,000	Neutral Evil	Mordenkainen's Tome of Foes
Seklaz	Coastal, Underwater	Humanoid	Sahuagin, Sahuagin Baron	Large	76	5	1,800	Lawful Evil	Ghosts of Saltmarsh
Sahuagin Baron	Coastal, Underwater	Humanoid	Sahuagin, Sahuagin Baron	Large	76	5	1,800	Lawful Evil	Monster Manual (5e)
Gem Greatwyrm	Arctic, Coastal, Desert, Feywild, Forest, Grassland, Hill, Mountain, Shadowfell, Swamp, Underdark, Underground, Underwater	Dragon	Gem Dragon	Gargantuan	507	26	90,000	Neutral	Fizban's Treasury of Dragons
Archdruid VGtM	Forest, Mountain, Swamp, Underwater	Humanoid	Any Race	Medium	132	12	8,400	Any Alignment	Volo's Guide to Monsters
Maw of Sekolah	Coastal, Underwater	Monstrosity	Shark	Huge	114	7	2,900	Neutral Evil	Ghosts of Saltmarsh
Ancient Dragon Turtle	Coastal, Underwater	Dragon	Dragon Turtle	Gargantuan	409	24	62,000	Neutral	Fizban's Treasury of Dragons
Giant Octopus	Underwater	Beast	Octopus	Large	52	1	200	Unaligned	SRD-CC v5.1, SRD-OGL v5.1
Merfolk	Coastal, Underwater	Overview	Humanoid, Merfolk						Varied
Fey Kelpie	Coastal, Feywild, Underwater	Plant	Fey	Medium	67	4	1,100	Neutral Evil	Rlyehable
Sea Spawn	Coastal, Underwater	Humanoid		Medium	32	1	200	Neutral Evil	Volo's Guide to Monsters
Jagged Koi Prawn	Underwater	Beast		Large	16	1/2	100	Unaligned	Journeys through the Radiant Citadel
Kraken	Underwater	Monstrosity	Titan, Kraken	Gargantuan	472	23	50,000	Chaotic Evil	SRD-CC v5.1, SRD-OGL v5.1
Shell Shark	Underwater	Monstrosity	Shark	Medium	32	2	450	Unaligned	Ghosts of Saltmarsh
Ixitxachitl Common	Coastal, Underwater	Aberration	Ixitxachitl	Small	18	1/4	50	Chaotic Evil	Out of the Abyss
Koalinth	Coastal, Underwater	Humanoid	Goblinoid, Hobgoblin, Koalinth	Medium	16	1/2	100	Lawful Evil	Ghosts of Saltmarsh
Kepmak	Coastal, Underwater	Humanoid	Sahuagin, Sahuagin Baron	Large	76	5	1,800	Lawful Evil	Ghosts of Saltmarsh
Sahuagin Priestess	Coastal, Underwater	Humanoid	Sahuagin, Cleric	Medium	33	2	450	Lawful Evil	Monster Manual (5e)
Dragon Turtle	Coastal, Underwater	Overview	Dragon, Dragon Turtle						SRD5, MM5, FToD
Archdruid MotM	Forest, Mountain, Swamp, Underwater	Humanoid	Any Race, Druid	Medium	154	12	8,400	Any Alignment	Monsters of the Multiverse
Merfolk Salvager	Coastal, Underwater	Humanoid	Merfolk, Merfolk Salvager	Medium	22	1	200	Neutral	Ghosts of Saltmarsh
Young Dragon Turtle	Coastal, Underwater	Dragon	Dragon Turtle	Huge	178	10	5,900	Neutral	Fizban's Treasury of Dragons