[When Fubuki asks that question, Shun holds the mask out in front of both of them and turns it around slowly - it's unmarked, but for the black lines that draw out the normal eye design of these masks.]

Nothing unusual. [As for Reisi's suggestion, Shun just nods, stepping back from the vent for the moment.]

I'll keep hold of this and see if I can get it to either someone familiar with magic, or one of the more reasonable older gods for more information.