Blight Beast

Slick Hide: If a creature attempts to grapple or otherwise restrain the Blight Beast physically then it does so with disadvantage on its roll.

Abomination: Any creature Non-Blighted within 20ft. of the Blight Beast must make a wisdom saving throw DC12 or be frightened by the Blight Beast, The creature can roll to see if it is no longer frightened at the start of its next turn.

Harbinger of Darkness: Unlike others of its kin, The Blight Beast does not have a disdain for light due to its ferocious nature, no matter where its prey may be, it will not relent and give in to the forces of light against its creator's dark designs.

Multiattack:  The Blight Beast can make one attack with its mandible latch/Oil Expulsion or two with its claws

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 2) piercing damage plus 2 (1d4) Necrotic.

Mandible Latch. The Blight Beast Latches to using it's maw a creature frightened by it or a willing creature. The target must make a DC 15 Constitution saving throw against its bite, taking 18 (2d10 + 5) necrotic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest.

Oil Expulsion (Recharge 5–6). The dragon exhales fire in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 24 (7d6) fire damage on a failed save, or half as much damage on a successful one.

Legendary Actions: The Blight Beast has 1 legendary action it can use, The action can be used at the end of any creature's turn other than the Blight Beast. this action is regained at the end of The Blight Beast's next turn.

Suicidal Allure: The Blight Beast has the effect on creatures to call them to its embrace,  if a creature other than the PC's is within sight of the Blight Beast, they must succeed in a wisdom saving throw DC:15 or use their reaction to dash towards the beast and into the beast's Maw, healing it 1d8+ the creatures hitpoints as it devours them.

Secretion: The Blight Beast can secrete 1d4 pools of Blight within 60ft of it in any unoccupied space that it can see or that is adjacent to an existing pool of Blight, any creature that makes contact with the Blight (That isn't Blighted) must make a Strength Saving throw DC 14 or be restrained if the creature is in the pool on the end of its next turn it takes 1d6 fire damage.