Yuan-Ti Nightmare Speaker

Yuan-Ti Nightmare Speaker CR: 4

Medium monstrosity (shapechanger, yuan-ti), neutral evil

Armor Class: 14 (natural armour)

Hit Points: 71 13d8+13

Speed: 30 ft

STR

16 +3

DEX

14 +2

CON

13 +1

INT

14 +2

WIS

12 +1

CHA

16 +3

Saving Throws: Wis +3, Cha +5

Skills: Deception +5, Stealth +4

Damage Immunities: Poison

Condition Immunities: Poison

Senses: Darkvision 120 ft (penetrates magical darkness), passive Perception 11

Languages: Abyssal, Common, Draconic

Challenge Rating: 4

Spellcasting (Yuan-Ti Form Only).The yuan-ti is a 6th level spellcaster. Its spellcasting ability is Charisma (spell save DC 13, +5 to hit with spells). It regains it's spell slots when it finishes a short or long rest. It knows the following warlock spells:

At will: Chill Touch, Eldritch Blast (range 300 ft, +3 bonus to each damage roll), Mage Hand, Message, Poison Spray, Prestidigitation.

2/day: Arms of Hadar, Darkness, Fear, Hex, Hold Person, Hunger of Hadar, Witch Bolt.

Shapechanger. The yuan-ti can use it's action to polymorph into a Medium snake or back into it's true form. It's statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. If it dies, it stays in it's current form.
Death Fangs (2/Day). The first time the yuan-ti hits with a melee attack on it's turn, it can deal an extra 16 3d10 necrotic damage to the target.
Innate Spellcasting (Yuan-Ti Form Only). The yuan-ti's innate spellcasting ability is Charisma (spell save DC13). The yuan-ti can innately cast the following spells, requiring no material components:
At Will: Animal Friendship (snakes only) 3/Day: Suggestion.
Magic Resistance. The yuan-ti has advantage on saving throws against spells and other magical effects.

Actions

Multiattack. The yuan-ti makes one constrict attack and one scimitar attack.
Constrict. Melee Weapon Attack +5 to hit, reach 10 ft, one target. Hit 6 1d6+3 bludgeoning damage, , and the target is grappled (escape DC 14) if it is a Large or smaller creature. Until the grapple ends, the target is restrained, and the yuan-ti can't constrict another target.
Scimitar (Yuan-Ti Form Only). Melee Weapon Attack +5 to hit, reach 5 ft, one target. Hit 6 1d6+3 slashing damage.
Invoke Nightmare (Recharges after a Short or Long Rest). The yuan-ti taps into the nightmares of a creature it can see within 60 feet of it, and creates an illusionary, immobile manifestation of the creature's deepest fears, visible only to that creature. The target must make a DC 11 Intelligence saving throw. On a failed save, the target takes 11 2d10 psychic damage and is frightened of the manifestation, believing it to be real. The yuan-ti must concentrate to maintain the illusion (as if concentration on a spell), which lasts for up to 1 minute can't be harmed. The target can repeat the saving throw at the end of each of it's turns, ending the illusion on a success, or taking 11 2d10 psychic damage on a failure.

Nightmare Speakers are dreaded priestesses of the yuan-ti. They receive nightmarish visions that they interpret as prophesies, and delight in torturing both slaves and prisoners, with their cruelty knowing no bounds. Each Nightmare Speaker is female from the waist up, and a snake from the waist down, and are part of the malison class.

Suggested Environments

Tropical and sub-tropical regions.