Can the D&D 5th Edition cantrip Chill Touch prevent regeneration and similar abilities?
Do specific forms of regeneration (like a troll's) circumvent this?
You create a ghostly, skeletal hand in the space of a creature within range. Make a ranged spell attack against the creature to assail it with the chill of the grave. On a hit, the target takes 1d8 necrotic damage, and it can't regain hit points until the start of your next turn. Until then, the hand clings to the target.
Troll rule text:
The troll regains 10 Hit Points at the start of its turn. If the troll takes acid or fire damage, this trait doesn't function at the start of the troll's next turn. The troll dies only if it starts its turn with 0 Hit Points and doesn't Regenerate.
Here is the now-unofficial ruling from Jeremy Crawford.
I can't tell if this is a classic case of specific-vs-general or just designer intent being unclear in RAW.