Cursed Pinocchio

Immutable form. Pinocchio is immune to any spell or effect that would alter its form.

False Appearance. While Pinocchio remains motionless, it is indistinguishable from an odrinary doll.

Multiattack. Pinocchio makes three Strings of the Puppeteer attacks.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 23 (3d8 + 10) piercing damage. If the target is a Large or smaller creature grappled by pinocchio, that creature is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside Pinocchio, and it takes 42 (12d6) acid damage at the start of each of Pinocchios turns.

If pinocchio takes 50 damage or more on a single turn from a creature inside it, pinocchio must succeed on a DC 25 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of pinocchio. If pinocchio dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.

Strings of the Puppeteer. Ranged Weapon Attack: +10 to hit, reach 30 ft., one target. Hit: 20 (2d6 + 10) piercing damage, and gets a string attached to them. When the target has three strings attached they are considered grappeled grappled. Until this grapple ends, the target is restrained. 
Each string can be cut as an attack action if the creature is wielding a slashing or piercing weapon.

Pinocchio can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Pinocchio regains spent legendary actions at the start of its turn.

Attack. Pinocchio makes one Strings of the Puppeteer attack.

Move. Pinocchio moves up to half its movement without causing opportunity attacks.

Puppet Master (Costs 2 Actions). Pinocchio unleashes one string and needle towards every creature witihn 30-foot radius. Each creature must succeed on a DC 23 Dexterity saving throw, taking 14 (2d6) piercing damage on a failed save, or half as much damage on a successful one and the strings doesn't attach.