Keen Smell. The cave tyrannosaurus has advantage on Wisdom (Perception) checks that rely on smell.
Sunlight Sensitivity. While in sunlight, the cave tyrannosaurus has disadvantage on Attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Variant: Cave Dinosaur Mutations: As a result of the specialized breeding programs of the Yuan-Ti, some cave dinosaurs differ from their kin and display odd mutations. While these mutations are not common, and even less so in populations in locations remote from the influences of the Yuan-Ti, the DM may roll a d100 before an encounter to determine what mutation appears:
01-10: The legs of this cave dinosaur are particularly large and muscular. The cave dinosaur gains an additional 10 ft. of movement and is unaffected by non-magical difficult terrain.
11-12: Remnants of the profane magic that transformed them still linger in the cave dinosaur’s scales, causing them to glimmer in the pale light. The cave dinosaur has advantage on Saving Throws against all Spells and magical Effects.
21-30: Like a chameleon, the scales of this cave dinosaur change color so as to blend in with their surroundings. The cave dinosaur has advantage on all Dexterity (Stealth) rolls it makes.
31-40: Globules of acid drip from this cave dinosaur’s mouth. The cave dinosaur is able to spit acid as per the spell Acid Splash, using Dexterity as the Spellcasting Ability.
41-50: Poison courses throughout the body of this cave dinosaur, and seeps forth from between every scale. All melee attacks the cave dinosaur performs deal an additional 1d6 worth of poison damage.
51-60: Barbels dangle from the sides of this cave dinosaur’s head, writhing gently in the dark. The cave dinosaur has 10 ft. of blindsight in addition to its other senses.
61-65: This particular cave dinosaur seems especially large and bulky. The cave dinosaur has advantage on all of its Strength checks against creatures of size Large or smaller, and it counts as one size larger when it comes to weight it can push or lift.
66-70: This particular cave dinosaur seems healthy and well-nourished. The cave dinosaur has advantage on all of its Constitution checks and is resistant to poison damage.
71-75: This particular cave dinosaur seems lithe and dextrous. The cave dinosaur is able to take the Disengage action as a bonus action on each of its turns.
76-80: Yuan-Ti rituals have enhanced the resistances of this creature. The cave dinosaur is resistant to lightning and fire damage.
81-85: Yuan-Ti rituals have enhanced the resistances of this creature. The cave dinosaur is resistant to cold and lightning damage.
86-90: Yuan-Ti rituals have enhanced the resistances of this creature. The cave dinosaur is resistant to fire and cold damage.
91-100: This cave dinosaur has grown a pair of large, almost draconic-looking wings upon its back. The cave dinosaur has a fly speed of 30 ft. in addition to its normal forms of movement.
Multiattack. The cave tyrannosaurus makes two attacks: one with its bite and one with its tail. It can't make both attacks against the same target.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 14). Until this grapple ends, the target is restrained, and the cave tyrannosaurus can't bite another target.
Tail. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4) bludgeoning damage.
Swallow. The cave tyrannosaurus makes one bite attack against a Small or Tiny target it is grappling. If the Attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the cave tyrannosaurus, and it takes 10 (3d6) acid damage at the start of each of the cave tyrannosaurus' turns. A cave tyrannosaurus can have only one creature swallowed at a time.
Description
Millenia ago, when the yuan-ti were still at the height of their empire and their god had not yet fallen into slumber, they made their first few attempts at expanding into and conquering the Underdark. With them came many great beast. The cave tyrannosaurus is one of these, the result of a combination of selective breeding and profane magics that transformed their mighty tyrannosaurus ancestors into smaller, more compact forms better adapted to life underground. Utilized in numerous roles, from guard beasts to combat mounts and even being used to herd other domestic beasts, they were tremendously loyal to their masters, though the same can't quite be said of them today. When the empire declined and many of the expansions into the Underdark fell, many of these deadly hunters went feral, the descendants of which can still be found today.
Adapted to the Dark. Countless centuries below ground, alongside the machinations of the yuan-ti, have altered the cave tyrannosaurs in various ways. Smaller and more compact compared to their ancestors, so as to better stalk the tunnels of the Underdark, their senses have also improved. A cave tyrannosaurus will often track prey by relying on smell alone, as its eyes, though adapted to seeing in the near-pitch blackness, are sensitive to bright lights. This weakness restricts these beasts to the darkness of the underground, though stories abound of terrible scaly monsters emerging from deep within caves to stalk the land on moonless nights.
Ravenous Appetites. Food can be scarce in the Underdark, and for a large beast, even more so. While the yuan-ti may have been able to reduce the size of the cave tyrannosaurs, they were not able to alter their ancestor's huge appetites. Encountered either alone or in mated pairs, these beasts are formidable and ravenous, observed to even swallow small prey whole in the midst of combat before they've even taken down other threats around them. A smart adventurer can use this hunger against them, baiting and luring them away with pungent hunks of meat and the like, as cave tyrannosaurs are more than willing to scavenge when the opportunity arises.
[Conversion of the Cave Tyrannosaurus from Miniatures Handbook of 3e to 5e]
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