Wendigo

Ambusher. The wendigo has advantage on attack rolls against creatures it has surprised.

Mimicry. The wendigo can mimic any sounds it has heard, including voices. A creature that hears the sounds can tell they are imitations with a successful DC 14 Wisdom (Insight) check.

 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 13 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.

Multiattack. The wendigo makes 2 melee attacks.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Psychic Scream (Recharge 6). The wendigo unleashes a silent scream that assaults the mind. Each creature within 30 ft of the wendigo must succeed on a DC 14 Wisdom saving throw or be stunned for one round. This does not affect other Wendigos