Tylosaurus (5e Creature)

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Large beast (marine reptile), unaligned

Armor Class 14 (natural armor)
Hit Points 133 (14d10 + 56)
Speed 0 ft., swim 60 ft.

24 (+7) 15 (+2) 19 (+4) 2 (-4) 17 (+3) 7 (-2)

Proficiency Bonus +5
Damage Immunities lightning
Senses darkvision 60 ft., passive Perception 13
Challenge 14 (11,500 XP)

Brute. A melee weapon deals one extra die of its damage when the tylosaurus hits with it (included in the attack).

Hold Breath. The tylosaurus can hold its breath for 1 hour.

Relentless (Recharges after a Short or Long Rest). If the tylosaurus takes 28 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead.

Siege Monster. The tylosaurus deals double damage to objects and structures.

Underwater Camouflage. The tylosaurus has advantage on Dexterity (Stealth) checks made while underwater.


Multiattack. The tylosaurus makes two attacks: one with its bite and one with its tail or two with its tail.

Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 34 (5d10 + 7) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained and the tylosaurus can't bite another target.

Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 33 (4d12 + 7) bludgeoning damage.

Ram. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 33 (4d12 + 7) bludgeoning damage and the target must succeed a DC 17 Constitution saving throw or be stunned until the end of its next turn.

Swallow. The tylosaurus makes a bite attack against a Large or smaller creature it is grappling. If the attack hits, the target is swallowed and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the tylosaurus, and it takes 28 (8d6) acid damage at the start of each of the tylosaurus's turns. A tylosaurus can have only one creature swallowed at a time.
If the tylosaurus takes 95 damage or more on a single turn from the swallowed creature, the tylosaurus must succeed on a DC 23 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 feet of the mosasaur. If the tylosaurus dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 feet of movement, exiting prone.


Rampage. When the tylosaurus reduces a creature to 0 hit points with a melee attack on its turn, the tylosaurus moves up to half its speed and makes a bite attack.


Unbridled Fury. In response to being hit by a melee attack, the tylosaurus can make one melee weapon attack with advantage against the attacker.

Source: TeslaMen on deviantart

Tylosaurus is one of the top predators in the oceans in the regions of Chuult and Arkamata. While its big brother, Mosasaurus, patrols the open seas, tylosaurus hangs out around the coasts and on the edge of continental shelves. Tylosaurus is able to recognize the sound of ships full of humanoids moving above it, and will do anything in its power to sink ships and devour the crew. Tylosaurus is the reason why Arkamata was never discovered until recently, nobody ever made it to the island. The tylosaurus will also eat anything small enough to fit in its jaws. This includes sharks, fish, turtles, marine reptiles, and whales. It has even been observed that the tylosaurus is immune to oceanic electric eels.

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