Ctelli, the Endless Hunger

Ravenous Aura: Ctelli, the Endless Hunger radiates a 20ft radius aura that invokes a ravenous hunger within all creatures within it. Creatures that remain inside the aura for prolonged periods rapidly fall victim to it's effects. Upon entering the aura, creatures must make a CON (DC 17) save. Upon failure the creature feels a stabbing pain in their stomach and take 10 (3d6) psychic damage. Upon a success, the creatures take no damage, but hears their stomach begin to grumble. Every time a creature finishes their turn within the aura, they must roll this save again. If a creature fails this save by 5 or more, they gain the Frightened Condition.

Endless Appetite: Whenever Ctelli reduces a creatures hit-points to 0, it regains 20 hit points as it absorbs the life essence of its victim. 

Eldritch Anatomy: Ctelli, the Endless Hunger can pass through spaces as narrow as 1-inch wide, as it's form constantly withers and distorts. 

Multiattack: Ctelli, the Endless Hunger makes three attacks, one with it's Ravenous Bite and two with it's Rending Claw attack.

Ravenous Bite: Melee Attack Roll +14, reach 10ft. Hit: 32 (4d10+10) piercing damage. If this attack reduces the target's health points to 0, it devours them entirely, leaving nothing but blood and gore behind. 

Rending Claw: Melee Attack Roll +14, reach 15ft. Hit 21 (3d8+8) slashing damage.

Banquet of Blood: (Recharge 4-5) Dexterity Saving Throw: DC 18, Constitution Saving Throw: DC 20, each creature in a 40ft long, 10ft wide Line must make a DEX save or take 43 (6d10+10) necrotic damage and must also make a CON save or be knocked prone as Ctelli, the Endless Hunger opens its maw to a non-sensical size and spews out an endless torrent of blood and viscera. 

Elusive Form: As a bonus action, Ctelli, the Endless Hunger can teleport to an unoccupied space within 35 ft. of itself, dissipating into thin air and reappearing at its chosen location. 

Feast on their Fear: When a frightened creature within 50ft of Ctelli, they can take a reaction to force the creature to make a WIS save (DC 19). On failure, the target takes 19 (4d6+5) psychic damage, as they get a vision of Ctelli devouring them.