Wendigo

Psychic Horror. When seen up close, the unnatural visage of the wendigo is capable of paralyzing the mind by overwhelming it with a sense of dread. When a creature that can see the wendigo starts its turn within 15 feet of the wendigo, the creature must make a DC 13 Wisdom saving throw. On a failed save, the creature takes 2d6 psychic damage, or half as much on a successful save. Additionally, if the creature fails the save, it becomes frightened.
Unless surprised, the creature can choose to avert its eyes to avoid the saving throw at the start of its turn. If the creature does so, it has disadvantage on attack rolls against the wendigo until the start of its next turn. If the creature looks at the wendigo in the mean time, it must immediately make the saving throw.

Ambusher. In the first round of a combat, the wendigo has advantage on attack rolls against any creature it surprised.

Elusive. If a creature opportunity attacks the wendigo they have disadvantage on the attack made against it.

Natural Stealth. The wendigo can take the Hide action as a bonus action.

Wendigo Fever. Creatures hit by a wendigo's bite attack must make a Constitution save or contract a supernatural disease. 24 hours after failing the save, the creature must make a DC12 Wisdom save or attempt to kill and eat the nearest creature. Every 24 hours thereafter, the DC increases by 2.

Multiattack. The wendigo makes two attacks: one with its bite, and one with its claws.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage.

Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 10 (1d8 + 6) slashing damage.

Piercing Shriek (Recharge 5-6). The wendigo emits a piercing shriek in a 60 ft. sphere. Each creature in that area must succeed on a DC 15 Wisdom saving throw or take 3d6 + 3 psychic damage and be frightened for 1 minute. Effected creatures can repeat the saving throw as an action on its turn. On a successful save, the creature is unaffected.

Devour Flesh. The wendigo may use and action and half its movement to feast upon the remains of a dead creature. The wendigo gains 10 (2d10) hit points.