I was discussing stuff with [MENTION=94725]Luz[/MENTION] and he suggested a 3e monster called a Famine Spirit kinda fit the bill. If nothing else the picture is great
I found a 5e conversation curtsey of
http://sefotron.blogspot.ca/2015/05/famine-spirit-cr-19-medium-undead.html?m=1
Famine Spirit
Medium Undead
(Chaotic Evil)
A.C. 18 (Natural Armour)
Hp: 262 (21d8+168) [189 - 336]
Speed: 60'
Str: 16 (+3) Dex: 11 (+0) Con: 26 (+8) Int:14 (+2) Wis: 15 (+2) Cha: 15 (+2)
Saving Throws: Constitution +14, Dexterity +6, Wisdom +8
Skills: Perception +8
Damage Resistances: Necrotic
Damage Immunity: Poison
Condition Immunity: Poisoned, Exhausted, Diseased, Unconscious
Senses: Darkvision 60'; Scent, See Invisible; Passive Perception: 18
Language: Spoken in life
CR: 19 (22,000 xp)
Aura of Pain: Creatures that start their turn within this aura are afflicted as if exposed to a Symbol of Pain unless they make a D.C. 16 Constitution saving throw. Once affected, they are Incapacitated for 1 minute (no save). Those that save against this effect are immune to that specific Spirit's aura for 24 hours.
Legendary Resistance: 3/day, when the Spirit would fail a saving throw, it may choose to succeed instead.
It Likes the Juice: The Spirit gains advantage on attack rolls against living enemies at 50% or fewer hit points.
Vorpal Bite: If the Spirit rolls a natural 20 with its Bite attack against a Large or smaller enemy, it removes their head, most likely causing instant death.
Scent: The Spirit has advantage on Perception checks that allow it to use its keen sense of smell.
See Invisible: The Spirit is under a permanent See Invisibility effect, which cannot be dispelled.
Create Spawn: In the rare cases that the Spirit does not consume a fallen foe, it rises as a Famine Spirit in 1d3 days unless their remains are blessed with aProtection from Good and Evil spell.
Multiattack: The Spirit makes two Claw attacks and a single Bite attack
Bite: Melee Weapon Attack, Reach 5', One Target, +9 to hit; Hit: 49 (4d20+3) piercing damage; Natural 20: Vorpal Bite (see above)
Claws: Melee Weapon Attack, Reach 5', One Target, +9 to hit; Hit: 29 (4d12+3) slashing damage.
BONUS ACTIONS
Etherealness: 3/day may cast theEtherealness spell.