Corrupted Wendigo

Corrupted Fortitude. If the corrupted wendigo is reduced to 0 hit points, it can make a constitution saving throw of 5+ the damage taken, if it succeeds, it is instead dropped to 1 hit point.

Corruptor. If the corrupted wendigo rolls a critical hit on its tearing bite attack or corrupting claws attack, the targeted creature must make a DC 18 constitution saving throw or become corrupted. If untreated for a week, the creature will transform into a corrupted or strayed creature, 2 days afterwards they will stop at nothing to return to where they were corrupted.

This can be cursed with a Greater Restoration spell.

Multiattack. The corrupted wendigo makes 2 claw attacks and one bite attack.

Tearing bite. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 26 (6d10 + 4) piercing damage plus 4 (1d8) necrotic damage. The targeted creature has to make a DC 12 constitution saving throw or become wounded.

Claws. Melee Weapon Attack: +9 to hit, reach  ft., 10 target. Hit: 13 (3d10 + 1) slashing damage. 

Corrupting Claws. (Special variant only) Melee Weapon Attack: +10 to hit, reach 10 ft., 1 target. Hit: 15 (3d10 + 1) slashing damage plus (3d8) necrotic damage. The target has to make a DC 16 constitution saving throw or take the full amount of necrotic damage on a failed save or take half as much on a success.

Antler Parry. If the corrupted wendigo is attacked with a melee or ranged attack, it can add a +3 bonus to its AC.