From the 3.5 FAQ Re: Mirror Image:
I think that is the easiest way. Although the other way (tracking what occupies which squares) might be more interesting/fun for some people.
If you use it the way FAQ says, when the real caster provokes an AoO (or gets attacked at any other time) just decide randomly if the opponent hits the caster or an image (For example: The caster has 5 images up, plus herself. Roll 1d6, if it lands on 1, the opponent hits the real caster).
Quote:
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Is there a way to decide which squares the figments from a mirror image spell occupy? Or do the images distribute themselves randomly? If it’s the latter, how does the DM decide where they go? Although the spell description says the images from a mirror image spell always stay within 5 feet of either the user or another image, it’s easiest to assume that all the images occupy the same space the spell user occupies. Any attack that can reach the user’s space can affect an image. |
If you use it the way FAQ says, when the real caster provokes an AoO (or gets attacked at any other time) just decide randomly if the opponent hits the caster or an image (For example: The caster has 5 images up, plus herself. Roll 1d6, if it lands on 1, the opponent hits the real caster).




