This question is very similar to my previous question here, and is more what I was originally trying to ask.
Jeremy Crawford clarified in the 19/JAN/2017 Sage Advice segment of the Dragon Talk podcast that a spell targets something if it affects that thing.
The Twinned Spell Metamagic states:
When you cast a spell that targets only one creature and doesn’t have a range of self... Emphasis mine
I am not sure how to interpret this section though and see two options.
- The spell needs to target exactly one creature and nothing else.
- The spell needs to target exactly one creature and then also any number of non-creature things, such as objects.
However, in the podcast Crawford does say fireball is not eligible to be twinned "Not only because initially you're not even targeting a creature, you're actually targeting a point in space...", and this seems to imply that my first interpretation is correct, but I am not sure.
This matters because light has the following in its spell description:
You touch one object that is no larger than 10 feet in any dimension... If you target an object held or worn by a hostile creature, that creature must succeed on a Dexterity saving throw to avoid the spell.
This spell explicitly targets an object and yet it also affects, and thus targets, a single creature, as they are forced to make a saving throw.
Which interpretation of "only one creature" is correct?