Yuan-ti Abomination

Large monstrosity (shapechanger, yuan-ti), Neutral Evil

Armor Class15 (natural armor)
Hit Points127 (15d10 + 45)
Speed40 ft.
STRDEXCONINTWISCHA
19 (+4) 16 (+3) 17 (+3) 17 (+3) 15 (+2) 18 (+4)
Saving Throws—
SkillsPerception +5, Stealth +6
Damage Vulnerabilities—
Damage Resistances—
Damage Immunitiespoison
Condition Immunitiespoisoned
Sensesdarkvision 60 ft., passive Perception 15
LanguagesAbyssal, Common, Draconic
Challenge7

Traits

Shapechanger.

The yuan-ti can use its action to polymorph into a Large snake, or back into its true form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It doesn't change form if it dies.

Magic Resistance.

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

Actions

Multiattack (Abomination Form Only).

The yuan-ti makes two ranged attacks or three melee attacks, but can use its bite and constrict attacks only once each.

Bite.

Melee Attack Roll: +7 to hit, reach 5 ft., one creature. Hit: 7 (1d6 + 4) piercing damage plus 10 (3d6) poison damage.

Constrict.

Melee Attack Roll: +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 (Abomination Form Only).

Melee Attack Roll: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Longbow (Abomination Form Only).

Ranged Attack Roll: +6 to hit, range 150/600 ft., one target. Hit: 12 (2d8 + 3) piercing damage plus 10 (3d6) poison damage.

Innate Spellcasting (Abomination Form Only)

The yuan-ti's innate spellcasting ability is Charisma (spell save DC 15). The yuan-ti can innately cast the following spells, requiring no material components:

At will: animal friendship (snakes only)

1/day: fear

3/day: suggestion