- Leviathan - Gargantuan Dire Mosasaurus (Hebrew)
- Krakens - Titanic Cephalopod with sixteen arms, eight used for locomotion and eight barbers arms used to snare prey, as well as two longer tentacles ending with a spiked pads. Can summon storms (Nordic)
- Saratan - Gargantuan Crab Monster that masks its shell as a small island to lure prey (Arabic)
- Charybdis - Gargantuan Sea Anenome-Sea Urchin Hybrid capable of summoning whirlpools (Greek)
- Lusca - Half Shark-Half Squid (Caribbean)
- Tannin - Sea Serpent Hydra Deity (Hebrew)
- Taniwha - Sahauagin Shark Demon Lord, Spawn of Dagon. Former Speaker. (Maori)
- Sisiutl - Two Headed Sea Serpent Deity (Pacific Northwest)
- Lyngbakr - Hafgufa Deity so large its back is mistaken for an island (Nordic)
- Koromodako - Duergar term for a Chardyis (Japanese)
- Isonade - Duergar term for a Lusca (Japanese)
- Tursas - Man-eating Walrus with bulls horns to sink boats (Nordic)
- Iku-Turso - Demon Lord of Tursas, Spawn of Dagon (Nordic)
- Hafgufa - Gargantaun Dire Whale (Nordic)
- Wasgo - Sea Wolves. Similar to Sea Lions but with a more lupine face and stronger articulated and clawed flippers used to slash at prey (Pacific Northwest)
- Cipactli - Leviathan deity (Aztec)
- Makara - Fey Leviathan (Hindu)
- Ketos - Titanic Quasi-Anthropomorphic Lobster-like Crustacean summoned by Deities to punish mortals and battle Krakens (Greek)
- Aspidochelone - Imperial scholastic term for Turtle Dragons (Greek)
- Apotamkin - Red Sea Serpents that steal children (Indigious)
- Akugyo - Merrow Demon Lord, Spawn of Dagon. Former Fey. (Japanese)
- Atuikakura - Duergar term for Aboleth (Japanese)
- Akkorokamui - Duergar term for Kraken (Japanese)
- Capricorn - Sea-Rams. Orca-like predators with ram like horns used to fight (Greek)
- Jormungandr - Ancient Terran term for Sea Serpents (Nordic)
- Scylla - Hydra Demon Lord, Spawn of Dagon. She has eight serpent heads surrounding the deformed upper body of a beautiful but hateful woman (Greek)
- Qalupalik - Artic Merrow (Inuit)
- Kurma - Duergar term for Turtle Dragon (Japanese)
- Bakunawa - Duergar term for Sea Serpent (Phillipino)
- Umibozu - Duergar term for Storm Giant (Japanese)
- Akhlut - Shark-Wolf hybrid. Possesses four limbs and a lupine body with forked tail, shark head, and webbed paws (Inuit)
- Kelpie - Ancient Terran term for Hippocampus (Welsh)
- Sea-Griffin - Griffin with the lower body of a fish (German)
- Siren - Cursed Winged Mermaids (Greek)
- Merrow - Monstrous Merfolk
- Merfolk - Anthropomorphic Piscine Humanoid with lower bodies of dolphins or fish
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