Styxosaurus (5e Creature)

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Gargantuan beast (marine reptile), unaligned

Armor Class 14 (natural armor)
Hit Points 203 (14d20 + 56)
Speed 10 ft., swim 60 ft.

25 (+7) 11 (+1) 18 (+4) 2 (-4) 10 (+0) 7 (-2)

Saving Throws Constitution +8
Skills Perception +4, Stealth +4
Senses passive Perception 14
Challenge 9 (5,000 XP)

Amphibious. Styxosaurus is able to breathe both air and water.

Elemental Balance. Whilst in water, the styxosaur has advantage on saving throws against all fire related attacks/effects. It has disadvantage on saving throws against all lightning based attacks/effects.

Siege Monster. Styxosaurus deals double damage to structures and objects.


Bite. Melee Weapon Attack: +11 to hit, reach 20 ft., one target. Hit: 29 (4d10 + 7) piercing damage. If the target is Large or smaller, the Styxosaurus immediately grapples the creature (escape DC18). It gains advantage on Bite attacks to a target grappled in this way.

Wave. (Recharge 4-6). The styxosaur creates a wave of water that is 40 feet long by 20 feet across. All creatures in its path must succeed a DC 18 Strength saving throw or take 22 (4d10) bludgeoning damage and be knocked prone, successful saves are not knocked prone and take half damage.


Styxosaurus is rare indeed, possibly the most elusive creature in the oceans. This is mostly because Styxosaurus is more commonly found in rivers and lakes rather than open seas. The Styxosaurus is mostly passive, preferring to go after fish and small aquatic prey by sneaking up on it before trapping it in its mouth and swallowing it whole.

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