Azothian Giganotosaurus

Colossal. The Azothian Giganotosaurus is immune to forced movement, does not provoke opportunity attacks and cannot make opportunity attacks. 

In addition, whenever the Azothian Giganotosaurus makes a weapon attack, regardless of whether the attack hits or misses, each creature within 10 feet of the attack's target other than the target or the Azothian Giganotosaurus itself must succeed on a DC 20 Dexterity saving throw or takes half the attack's damage.

Legendary Resistance (3/Day). If the Azothian Giganotosaurus fails a throw, it can choose to succeed instead.

Frightful Presence. Each creature that is within 120 feet of the Azothian Giganotosaurus and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 3 rounds. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the Azothian Giganotosaurs Frightful Presence for the rest of the day.

Azoth's Rage. Upon reaching 300 health points, the Azothian Giganotosaurus enters a highly spiteful and rageful state, increasing its damage by +10 to all attacks and enabling it to attack 4 times in one turn. This effect lasts until the Azothian Giganotosaurus is defeated or regains its health to above 300 health points.

Multiattack. The Azothian Giganotosaurus makes three attacks: two with its bite and one with its claw.

Bite. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 45 (4d12 + 10) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and the Azothian Giganotosaurus can't bite another target.

Claw. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 44 (4d10 + 10) slashing damage. If the target is a creature of lesser size, it must succeed on a DC 27 strength saving throw or be flung up to 40 feet away from the Azothian Giganotosaurus, landing prone.

Tail. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 30 (3d8 + 10) bludgeoning damage. If the target is a creature of lesser size, it must succeed on a DC 30 strength saving throw or be flung up to 80 feet away from the Azothian Giganotosaurus, landing prone.

Ram. Melee Weapon Attack: +18 to hit, reach 5 ft., one target. Hit: 50 (4d10+20) bludgeoning damage. If the target is a creature, it must succeed on a DC 20 Strength saving throw or be shoved 20 feet directly away and knocked prone.