homebrew by Team Brievary
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 14 Wisdom (Insight) check. Magic Resistance. The Wendigo has advantage on saving throws against spells and other magical effects. Wendigo Curse. The creature, other than an undead or construct, that lands a killing blow on the Wendigo begins to transform after 2d4 days into a Wendigo themselves. the Transformation takes 30 days and begins subtly (slightly paler skin, thinner and taller body) but advances with each passing day (DC 20 Perception/Medicine check to notice changes at the beginning and DC lowers as curse progresses). Every time the cursed creature notices a dead body of a sentient humanoid within 60 feet of it, it must succeed on a DC 15 Charisma saving throw or be forced to spend it's movement to get to the body and action to begin devouring it. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Each time the cursed creature devours flesh of a sentient humanoid, it lowers number of days to finish transformation by 5.
Multiattack. The Wendigo makes three attacks: one with its bite and two with its claws. If it can, Wendigo uses its Hallowing Roar instead of a Bite attack. Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit 8 2d4+3 piercing damage plus 10 3d6 necrotic damage. Claw. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit 10 2d6+3 piercing damage plus 7 2d6 cold damage. The target has to make a DC 17 constitution saving throw or take an additional 7 2d6 cold damage on a failed save or half as much on a successful save. Hallowing Roar (Recharge 6). The Wendigo emits a thundering roar. Each creature within 30 feet of the Wendigo must succeed on a DC 14 Wisdom saving throw or take 14 4d6 psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.