Stuhac

Mountain Walk. The stuhac can move across and climb rocky surfaces without needing to make an ability check. Additionally, difficult terrain composed of rocks or rocky debris doesn't cost it extra movement.

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

Multiattack. The stuhac can use Hobble. It then makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 20 (4d6 + 6) piercing damage.

Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 28 (5d8 + 6) slashing damage.

Hobble. The stuhac telekinetically tears the tendons and ligaments of one creature it can see within 60 feet of it. The target must succeed on a DC 18 Constitution saving throw or take 13 (3d8) force damage and its speed is reduced by 10 feet. The stuhac can't reduce a creature's speed below 0 feet with this action. This reduction lasts until the creature finishes a long rest or until removed by the greater restoration spell or similar magic.

Illusory Appearance. The stuhac covers itself and anything it is wearing or carrying with a magical illusion that makes it look like another creature of its general size and Humanoid shape. The illusion ends if the stuhac takes a bonus action to end it or if the stuhac dies.