Yuan-ti Malison (Type 1)

Medium Monstrosity, Neutral Evil

AC: 12

Initiative: +2 (12)

HP: 66 (12d8 + 12)

Speed: 30 ft., climb 30 ft. (snake form only)

STR: 16 (+3)
DEX: 14 (+2)
CON: 13 (+1)
INT: 14 (+2)
WIS: 16 (+3)
CHA: 12 (+1)

Skills: Stealth +4 (+6 while in snake form)

Immunities: poison

Condition Immunities: poisoned

Senses: Darkvision 60 ft., Passive Perception 13

Languages: Abyssal, Common, Draconic

CR: 3 (XP 700; PB +2)

Habitat: Desert, Forest, Swamp, Urban

Treasure: Relics

Magic Resistance.

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

Spellcasting (Yuan-ti Form Only).

The yuan-ti casts one of the following spells, requiring no Material components and using Wisdom as the spellcasting ability (spell save DC 13):

At will: Animal Friendship (snakes only)

2/day: Suggestion

Actions

Multiattack.

The yuan-ti makes two attacks, using Bite or Poison Ray in any combination, and it can use Spellcasting to cast Suggestion if available.

Bite.

Melee Attack Roll: +5, reach 5 ft. Hit: 5 (1d4 + 3) Piercing damage plus 7 (2d6) Poison damage.

Poison Ray (Yuan-ti Form Only).

Ranged Attack Roll: +5, range 120 ft. Hit: 12 (2d8 + 3) Poison damage.

Bonus Actions

Shape-Shift.

The yuan-ti shape-shifts into a Medium snake or returns to its true form. If it dies, it stays in its current form. The yuan-ti's game statistics are the same in each form, except where noted. Any equipment it is wearing or carrying isn't transformed.

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Source: Monster Manual (2025), p. 343 - Licenses and attribution