Multiattack. The Terraptor makes two attacks: one with its beak and one with its tail barb.

Beak. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 2) piercing damage.

Tail Barb. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) slashing damage, and the target must succeed on a DC 12 Constitution saving throw against being magically petrified. On a failed save, one of the creatures limbs turn to stone. Roll a d4 to determine which limb is affected:

1 - Face. Half of the creature's face is encapsulated by stone making it impossible to speak or cast verbal component spells. If this area is struck again, the creature is blinded, deafened, and incapacitated.

2 - Arm. One arm is turned to stone. The use of two-handed weapons become  impossible, and martial ranged weapons attacks are made with disadvantage. If this area is struck again, the creature looses functionality of both arms and cannot use martial weapons or somatic spells.

3 - Leg. One leg is turned to stone. The creature's movement is halved and Dexterity saving throws are made with disadvantage. If this area is struck again, both legs are turned to stone and the creature's movement is 0.

4 - Chest. Part of the creature's torso is turned to stone. Constitution saving throws are made with disadvantage.  If this area is struck again, the creature's total hit point maximum is cut in half.

The effects of the Tail Barb's partial petrification last until the creature is cured of the petrified such as using Greater Restoration.