3 added 211 characters in body
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I read it this way. The spell creates an image of a creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Physical interaction with the image reveals it to be an illusion, because things can pass through it.

In regards to targeting the illusion:

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist. You believe it is a creature, so you choose it as a target.

I read it this way. The spell creates an image of a creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist.

I read it this way. The spell creates an image of a creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Physical interaction with the image reveals it to be an illusion, because things can pass through it.

In regards to targeting the illusion:

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist. You believe it is a creature, so you choose it as a target.

2 changed "image of creature" to "image of a creature"
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I read it this way. The spell creates an image of a creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist.

I read it this way. The spell creates an image of creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist.

I read it this way. The spell creates an image of a creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist.

1
source | link

I read it this way. The spell creates an image of creature, and the caster believes it to be a creature, so that can be a valid target of the spell. The spell hits the space the illusion is in. Since the illusion has been interacted with, it is now clear the creature is an illusion.

Each dart hits a creature of your choice that you can see within range.

You are choosing a creature, that creature just happens to not really exist.