Tylosaurus (5e Creature)
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Large beast (marine reptile), unaligned
Brute. A melee weapon deals one extra die of its damage when the Tylosaur hits with it (included in the attack).
Hold Breath. The tylosaur can hold its breath for an hour.
Rampage. When the tylosaur reduces a creature to 0 hit points with a melee attack on its turn, the tylosaurus can take a bonus action to move up to half its speed and make a bite attack.
Siege Monster. The tylosaur does double damage to objects and structures.
Multiattack. The tylosaur 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 19). Until this grapple ends, the target is restrained and the tylosaur 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. Target must succeed a DC 18 Constitution saving throw or be stunned for one turn, the Tylosaurus may use an opportunity to use a bite the target.
Swallow. The Tylosaurus makes a bite attack against a Large or smaller creature it has grappled and 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 tylosaur, and it takes 28 (8d6) acid damage at the start of each of the Tylosaur's turns. A Tylosaur can have only one creature swallowed at a time.
Unbridled Fury. In response to being hit by a melee attack, the Tylosaurus can make one melee weapon attack with advantage against the attacker.
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.