In Volo's Guide to Monsters, the Yuan-Ti "Unusual Abilities" section (p. 98) lists a number of action options that might be given to high-ranking yuan-ti, one of which is:
Polymorph into Snake (Abomination or Malison Only; Recharge 6). The yuan-ti targets a creature it can see within 60 feet of it. The target must succeed on a Wisdom saving throw or be transformed into a Tiny poisonous snake, as if affected by the polymorph spell. The save DC is the same as that of the yuan-ti's Innate Spellcasting ability.
It's not stated that you cast polymorph; it says that the target is transformed "as if affected by the spell".
Here's my rulings based on my understanding of the rules.
Is the yuan-ti casting polymorph? No, and it can't be Counterspelled. But the target is then affected by the magic of a spell. Targets immune to magic, spells, or polymorph effects are also immune to this effect. The effect can be dispelled, where it is considered 4th level magic.
And if it's not a spell but a "special trait": Does it requires concentration? No.
What's its duration? 1 hour, or until the target drops to 0hp. You can kick your friend until they turn back to a humanoid.
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In Volo's Guide to Monsters, the Yuan-Ti "Unusual Abilities" section (p. 98) lists a number of action options that might be given to high-ranking yuan-ti, one of which is:
Polymorph into Snake (Abomination or Malison Only; Recharge 6). The yuan-ti targets a creature it can see within 60 feet of it. The target must succeed on a Wisdom saving throw or be transformed into a Tiny poisonous snake, as if affected by the polymorph spell. The save DC is the same as that of the yuan-ti's Innate Spellcasting ability.
It's not stated that you cast polymorph; it says that the target is transformed "as if affected by the spell".
What's "as if affected by the spell" means?
Is the yuan-ti casting polymorph?
And if it's not a spell but a "special trait":
Does it requires concentration?
What's its duration?
Here's my rulings based on my understanding of the rules.
Is the yuan-ti casting polymorph? No, and it can't be Counterspelled. But the target is then affected by the magic of a spell. Targets immune to magic, spells, or polymorph effects are also immune to this effect. The effect can be dispelled, where it is considered 4th level magic.
And if it's not a spell but a "special trait": Does it requires concentration? No.
What's its duration? 1 hour, or until the target drops to 0hp. You can kick your friend until they turn back to a humanoid.