Wendigo

Ethereal Sight. The ghost can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa

Decaying Curse. If a creature makes physical contact, with or without a melee weapon, with the Wendigo, they must make a DC 12 con save. If failed, the creature takes 1d4+2 necrotic damage.

Withering Touch. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 17 (4d6 + 3) necrotic damage.

Horrifying Visage. Each non-undead creature within 60 feet of the wendigo that can see it must succeed on a DC 13 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 10 years. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to this ghost's Horrifying Visage for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.

Hunger Possession. A target is selected at random and must pass a DC 15 con save, if they fail then for 4 turns they are affected by "Eternal Hunger". While affected, the target will have to make a DC 13 con save each turn to not have their attack target a party member.

Winter's Bite. The wendigo bites an opponent and does 2d4+3 frozen damage

Multi-Attack. The wendigo can slash and/or bite up two 3 times, that can be divided between up to 3 targets

Slash. 2d4+3 slashing damage

Bite. 1d8+3 piercing damage

Feast on Flesh. The wendigo, if there is a dead player or creature within 15 ft, may eat a corpse to recover 2d4+1