I know it isn't. I'm... sorry. But I do think we absolutely cannot afford to let our guard down too far. Let's see... I think it may be more Demons, next. We should be prepared for anything, of course, but I believe it might be Demons.
You would think they would be, especially for the more... outwardly expressive ones. Ruby's rose petals, or Professor Goodwitch's abilities, for instance. It shouldn't be too hard to show you around. I'll ask Amycus about it soon.
Did you want to come with me? To inspect it, I mean. If you have some free time, and assuming it IS dust, it would be far easier to catalog with someone else who is as organized and coordinated as you are.