Chatacabra

Adhesive Stone Gauntlets. As a bonus action, the Chatacabra can use its sticky tongue to coat its forelimbs in debris, forming stone gauntlets. While armored this way, its AC increases by 2, and its Slam attacks deal an extra 4 (1d8) bludgeoning damage. If the Chatacabra takes 15 or more damage from a single attack, the gauntlets shatter and must be reapplied.

Standing Leap. The Chatacabra's long jump is up to 30 feet and its high jump is up to 15 feet, with or without a running start.

Flee Mechanic. When the Chatacabra's HP is reduced to 45 (2/3) and 22 (1/3) for the first time, it immediately uses its reaction to emit a Deafening Roar. Every creature within 15 feet must succeed on a DC 13 Constitution saving throw or be Stunned until the end of their next turn. The Chatacabra then moves up to its speed without provoking opportunity attacks and attempts to flee to a different area.

Weakened State. The Chatacabra can only be successfully Captured (using traps/tranqs) if its current hit points are 22 (1/3) or lower.

Multiattack. The Chatacabra makes two attacks: one with its Tongue and one with its Slam or Bite.

Tongue. Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage. If the target is a Medium or smaller creature, it is Bound (DC 13  Strength to escape). The Chatacabra can then pull the target up to 10 feet toward itself as a bonus action.

Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage. If the Chatacabra has its Stone Gauntlets active, the target must succeed on a DC 13 Strength saving throw or be knocked prone.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) piercing damage.