Wendigo

Keen Smell. The Wendigo has advantage on Wisdom (Perception) checks that rely on smell. Can store scents and track humanoid creatures blood once stored.

Starvation. While in the form, you must consume one medium humanoid an hour or perform a CON saving throw of 13.

If you fail to consume enough humanoids or fail the Con saving throw Dm will take control of the Wendigo

Multiattack. In Wendigo form, it makes two attacks.

Bite. Melee Weapon Attack: [d20]+7to hit, reach 5 ft., one target.2d10+4 piercing damage.

If the target is a humanoid, it must succeed on a DC 15 Constitution saving throw or be cursed with 1d6 necrosis. Saved throws do not get cursed

If the target is not a humanoid, it must succeed on a DC 12 Constitution saving throw or be cursed with 1d6 necrosis. Saved throws do not get cursed

Claw . 1D20+7 ;2d8+4 damage

Action surge: Starting at 2nd level, you can push yourself beyond your normal limits for a moment. On your turn, you can take one additional action on top of your regular action and a possible bonus action. You must roll 1d4 to determine hunger.

Once you use this feature, you must consume the d4 of humanoid creatures  before you can use it again. Starting at 17th level, you can use it twice before a rest, but only once on the same turn.

level 7 it gains a 3rd attack

level 10 it gains 4th attack