Carturok, The Demon Minotaur

Charge. If Carturok moves at least 10 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 13 (3d8) piercing damage. If the target is a creature, it must succeed on a DC 21  Dexterity saving throw or higher takes half damage from the gore attack.  20 or below creature must make a DC 17 Strength saving throw or the creature becomes impaled by the horns and gains the grappled condition will take 12 (3d8) damage at end of its turn until it frees itself with a strength save of 16. Then has bleeding effect for following round. 

Labyrinthine Recall. The minotaur can perfectly recall any path it has traveled.

Reckless. At the start of its turn, Carturok can gain advantage on all melee weapon attack rolls it makes during that turn, but attack rolls against it have advantage until the start of its next turn.

Witch Hunters Glaive. Advantage on Saving Throws against spells and other magical effects while wielding this weapon.

Legendary Resistance (3/Day). If Carturok fails a saving throw, he can choose to succeed instead.

Multiattack. Carturok can make three Giant Spear

Witch Hunters Glaive. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 9) slashing damage.

Back side Stike. Back end of the spear has been adorned with the skull of a horned creature. can be used as a melee weapon against those directly behind the Carturok. Melee Weapon Attack: +1 to hit, Reach 15 ft. one target . Hit 19 (2d10 +9) Bludgeoning damage 

Gore. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 7) piercing damage.

Giant Sweep Strike (Recharge 5-6). Carturok may use its Spear and make a 180 degree swipe at all targets with in 15 feet of the monster. Melee Weapon Attack : +11 to hit, reach 15ft, all targets  in 15 radius (half circle) in front of creature. Hit 21 (2d12 +9) slashing damage. 

Carturok 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. He regains spent legendary actions at the start of its turn.

Minotaur's Roar (Costs 2 Actions) - when Carturok lets out his roar everyone within a 30 foot cone in front of him must make a DC 21 Wisdom saving throw or be Frightened of him.

Weapon Attack (Costs 1 Action). Carturok makes 2 weapon attacks.