"I'm well acquainted with Fey. [ She has a campaign trait that gives her bonuses with fey] and they have no natural resistance to illusion. Second, I don't plan to place the illusion close enough for sound to be much of an issue. Third, any creature viewing an illusion have to either interact with the illusion, as in touch it or scrutinize it carefully because they suspect something is amiss. My guess is these creatures are not intellectual giants and won't be suspecting an illusion. Also, Elan has a spell called ghost sounds that if necessary will add more believably if it is required. But if you have a better idea how about you offer it up. I would happily entertain it."
[OoC: The DM just posted we can use Sense Motive to learn more about the kobolds.]
[OoC: The DM just posted we can use Sense Motive to learn more about the kobolds.]