Wendigo

Sunlight Sensitivity. While in sunlight, the wendigo has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Mimicry. The Wendigo can mimic animal sounds and humanoid voices. A creature that hears the sounds can tell they are imitations with a successful DC 17 Wisdom (Insight/Nature) check.

Masks of the Wild. The wendigo can attempt to hide even when it is only lightly obscured by foliage, heavy rain, falling snow, mist, or other natural phenomena.

Devour. When the Wendigo Uses a bite attack and succeeds, it will automatically regain the amount of hit points dealt to the enemy.

Pounce. If the wendigo moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 19 Strength saving throw or be knocked prone. If the target is prone, the wendigo can make one bite attack against it as a bonus action.

Regeneration. The wendigo regains 10 hit points at the start of its turn, as long as it has at least 1 hit points. If the wendigo takes acid, fire, or radiant damage, this trait doesn't function at the start of the wendigo's next turn.

Legendary Resistance (1/Day). If the Wendigo fails a saving throw, it can choose to succeed instead.

Multi-attack. The wendigo makes two attacks: two claw attacks; or one claw and one bite. If it can, wendigo uses its Murderous Cry instead of a Bite attack.

Bite. Melee Weapon Attack:  +8 to hit, reach 5 ft., one target. Hit: 9  (1d8 + 4) piercing damage and 7  (2d6) necrotic damage.

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage. If the target is a medium or smaller creature that the wendigo already hit with two claw attacks this turn, the target is grappled (escape DC 17). Until this grapple ends, the creature is restrained and the wendigo can't use its claws against another target.

Murderous Cry (Recharge 4 turns). The wendigo emits an inhuman cry. Each creature within 30 feet of the wendigo must succeed on a DC 15 Wisdom saving throw or take 14 (4d6) psychic damage and be frightened for 1 minute. On a success, take half damage and are not frightened. A creature that failed can repeat the saving throw at the end of each of its turns, ending the effect on a success.

Nimble Escape.  Can take the disengage or hide action as a bonus action on each of it's turns.

Uncontrollable Hunger.  If the wendigo has a creature grappled, it can make a bite attack on it as a bonus action.

The Wendigo can take 2 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. The Wendigo regains spent legendary actions at the start of its turn.

Claw. The Wendigo makes one claw attack against the creature attacking it.

Hit and Run (Costs 2 Actions). The Wendigo attempts to grapple a creature within 10ft. of it (escape DC 14) and if successful will move up to 40ft. away from any creature it perceives. If the Wendigo is already grappling a target it will just move.

Ravenous Hunger(Costs 2 Actions). The wendigo can curse one creature that it can see within 120 feet of it. The target must makes a DC 17 Wisdom saving throw. If the target fails, it take (1d6) Wisdom damage and is cursed. A creature can repeat the saving throw on each of its turns, ending the curse on a success. While cursed, a creature loses (1d4) Wisdom damage at the start of each of its turns. When a cursed creature's Wisdom reaches 1, they seek an individual of their race to kill and devour. After completing this act, the creature begins to transform, taking 2d4 rounds to morph into a wendigo. Once the transformation is complete, the creature is effectively dead, replaced by a new wendigo. True resurrection, reincarnate, or wish can restore such a creature to life, yet doing so does not harm the new wendigo. (Any creature that has sufftered from the effects of ravenous hunger, well regain all lost wisdom once they finish a long rest.)