Wendigo Spirit

Keen Senses. The Wendigo has Advantage on Wisdom (Perception) checks made to hear or smell.

Mimicry. The Wendigo can mimic any animal noises or anything spoken unerringly. To determine that the sounds are fake, it can make a DC: 17 Wisdom (Insight) check to know they are not real.

Regeneration. Unless the Wendigo takes any Fire damage since it's last turn, it will regenerate 10 hit points at the start of every one of it's turn. 

Sunlight Sensitivity. The Wendigo has disadvantage on attack rolls and on Wisdom (Perception) checks that rely on sight when, the target of it's attack, or whatever it is trying to perceive is in direct sunlight.

Actions. The Wendigo makes two claw attacks and one attack with either a bite or with it's antlers.

Bite. The Wendigo. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 18 (4d6 +4) [Piercing] damage. 

Claw. The Wendigo. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 17 (3d8 +4) [Slashing] damage. 

Antlers. The Wendigo. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 10 (2d12 +4) [Piercing] damage, target also needs to make a DC:15 Strength saving throw or be knocked Prone.

Vengeful Spirit. The Wendigo when it drops to 0 hit points will use it's reaction, as a last ditch effort to have a host, will target one creature within 500 ft to possess them. The target needs to make a DC:12 Charisma saving throw, and on a failed save become possessed. A possesses target will be affected over the course of six days, in which they are unable to consume anything but humanoid flesh, as they vomit everything else up. Each day the don't consume flesh they are granted one point of exhaustion that a long rest does not cure. Any Remove Curse or Cure Disease spell removes this effect and the target can function normally.