Legendary Resistance (2/Day). If the yuan-ti fails a saving throw, it can choose to succeed instead.
Innate Spellcasting. The yuan-ti's innate spellcasting ability is Charisma (spell save DC 16). 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.
Mind Fangs (3/Day). The first time the yuan-ti hits with a melee attack on its turn, it can deal an extra 16 (3d10) psychic damage to the target.
Spellcasting. The yuan-ti is a 7th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). It regains its expended spell slots when it finishes a short or a long rest. It knows the following Warlock spells:
Cantrips (at will): eldritch blast (range 300 ft., +5 bonus to each damage roll), friends, message, minor illusion, poison spray, prestidigitation
1st-4th level (2 4th-level slots): banishment, charm person, confusion (single use), crown of madness, darkness, detect thoughts, hypnotic pattern, illusory script, [Tooltip Not Found] (or blight)
Sseth's Blessing. When the yuan-ti reduces an enemy to 0 hit points, the yuan-ti gains 12 temporary hit points.
Multiattack. The yuan-ti makes three melee attacks, but can use its bite and constrict attacks only once each.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage plus 10 (3d6) poison damage.
Constrict. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage, and the target is grappled (escape DC 14). Until this grapple ends, the target is restrained, and the yuan-ti can't constrict another target.
Scimitar. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
The yuan-ti can take 1 legendary action, choosing from the options below. It can only take this action at the end of another creature's turn. The yuan-ti regains spent legendary actions at the start of its turn.
Move. The yuan-ti moves up to half its speed without provoking opportunity attacks.
Cantrip. The yuan-ti casts one of its cantrips.
Attack. The yuan-ti makes one scimitar attack.
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