Wendigo

Fortitude. If damage reduces the wendigo to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is from a critical hit. On a success, the wendigo drops to 1 hit point instead.

Ice Walk.  The wendigo does not require and ability check to move over icy surfaces. Additionally difficult terrain composed of ice and snow doesn't cost it extra movement.

Rampage. If the wendigo reduces and enemy to zero hit points it can use a bonus action to move up to half its movement and make a bite attack.

Multi-Attack. The wendigo makes three attacks either two with its claws and one with its bite or one with its gore and two with its bite.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4(1d4+2) piercing damage.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5(1d6+2) slashing damage

Gore. Melee Weapon Attack: +4 to hit, reach  5ft., one target. Hit: 6(1d8+2) piercing damage.  

Maddening Feast.The wendigo feasts on the corpse of one enemy within 5 ft. that died within the last minute. Each creature of its choice within 30 feet must succeed on a DC 10 wisdom saving throw or become frightened of the wendigo for 1 minute. While frightened in this way a creature is incapacitated, can't understand what others say, can't read and only speaks in gibberish. When the effect ends the creature is immune to the effects of Maddening feast for 24 hours.