Apex Devourer. When the carnosaur reduces a creature to 0 hit points, it can make one Bite attack as a Reaction and gains 30 temporary hit points.
Titanic Physiology. The carnosaur is immune to the extra damage caused by Critical Hits.
Relentless Predator. While the carnosaur is below half its hit points, it has Advantage on attack rolls, its Speed increases to 60 feet, and its Bite scores a critical hit on a roll of 19–20.
Jungle Tyrant. The carnosaur ignores Difficult Terrain caused by plants, undergrowth, or natural forest features.
Multiattack. The carnosaur makes four attacks: one with its Bite, two with its Claws, and one with its Tail.
Bite. Melee Attack Roll: +15, reach 15 ft. Hit: 4d12 + 9 piercing damage. The target is Grappled (escape DC 19). If the target is already Grappled by the carnosaur, it is instead swallowed. A swallowed creature is Blinded and Restrained, has total cover against attacks and effects outside the carnosaur, and takes 12d6 acid damage at the start of each of the carnosaur’s turns. If the carnosaur takes 30 damage or more on a single turn from a creature inside it, it must succeed on a DC 18 Constitution saving throw or regurgitate all swallowed creatures. A regurgitated creature falls Prone in a space within 10 feet of the carnosaur.
Claw. Melee Attack Roll: +15, reach 10 ft. Hit: 3d8 + 9 slashing damage.
Tail. Melee Attack Roll: +15, reach 20 ft. Hit: 3d10 + 9 bludgeoning damage. The target must succeed on a DC 19 Strength saving throw or be knocked Prone.
Savage Rush. The carnosaur moves up to half its speed.
Predatory Reflexes (2/round). When the carnosaur is hit by an attack, it can move up to 20 feet and make one Claw or Bite attack.
The carnosaur can take 3 Legendary Actions, choosing from the options below. Only one Legendary Action can be used at a time and only at the end of another creature’s turn.
Move. The carnosaur moves up to half its speed.
Tail Sweep. Each creature within 10 feet must succeed on a DC 18 Dexterity saving throw or take 4d8 bludgeoning damage and be knocked Prone.
Bite. The carnosaur makes one Bite attack.
Terrifying Roar (Costs 2 Actions). Each creature of the carnosaur’s choice within 30 feet must succeed on a DC 17 Wisdom saving throw or be Frightened until the end of its next turn.
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