Actually, I believe that shouldn't be a concern as of now: as we can deduce, the being conveying these messages is a higher being of enough power that it can transmit these messages through the dream realm to multitude of people. It also possesses a degree of clairvoyance; I spoke to clock, who will be attending to other matters and will not be present this market day, and she has not experienced this dream. That means that, in addition to being able to send images that it most likely did not witness in person, it was privy to the intentions of those who will be present, even across the mist. Also, we can rule out the possibility of it being a member of the elder races we saw, as they seemed extremely confused at the appearance of the white figures, and the images shown indicate a deeper knowledge of the situation, though most likely from a position of non-interference or inability to do so directly.
Coincidentally, the first being that comes to mind would be an affiliate of the lightning plane: I met and spoke, at length, to transcendent when I traveled across the mists. I discovered that the Lightning plane has ties to the power of time and a degree of clairvoyance, and it may be no coincidence that a djinn, a being of lightning, was a part of these dreams. That being said, I can't imagine a possible motive for said being, if an affiliate of the lightning plane, past the djinn, who's action may not be condoned by the higher powers.
Obviously, most of this is speculation, but if there is one thing I'm relatively positive of, it's that this being, regardless of it's nature, means no direct harm to us, at least past the obvious danger of confronting these problems. That being said, I believe it is no cause for alarm at this moment in time.
- Wycliff, the Seeker.