Devil’s Sight. Magical darkness doesn’t impede the yuan-ti’s darkvision.

Magic Resistance. The yuan-ti has advantage on saving throws against spells and other magical effects.

Poisoner Adept. The yuan-ti has advantage on attacks if the target is poisoned. All attacks deal an additional 2d6 poison damage when the yuan-ti has advantage on the attack.

Zehir's Blessing. The yuan-ti has advantage on Charisma (Deception) checks against creatures other than yuan-ti.

Multiattack. The yuan-ti makes one Bite attack and two Scimitar attacks, or it makes two Spectral Fangs attacks.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage plus 7 (2d6) poison damage. The target must make a DC 15 Constitution saving throw. On a failed save, the target is poisoned for 1 minute.

Scimitar (Yuan-ti Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Spectral Fangs. Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 16 (3d8 + 4) poison damage.

Spellcasting (Yuan-ti Form Only). The yuan-ti casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 15):

At will: animal friendship (snakes only), minor illusion, mage hand, message

3/day: suggestion

2/day each: fear, invisibility

Change Shape. The yuan-ti transforms into a Medium snake or back into its true form. Any equipment it is wearing or carrying isn’t transformed. If it dies, it stays in its current form. While in snake form, the yuan-ti has advantage on Dexterity (Stealth) checks to hide, otherwise its statistics are the same in each form.

Cunning Escape (Snake Form Only). The yuan-ti doubles its move speed for the turn and may take the Hide action for free at the end of its turn.