Some of the people I've been talking to think the common thing with the first two was that we had to drink something...tea for the dragon one and wine for the kitsune. But this one kind of broke that pattern, so it's harder to tell now...

[His finger moves through the air a bit vaguely, though, as if he's still thinking about something.] But if you think about it, this one definitely fits Iris, and the nine-tails thing was meant to be some kind of aspect of Cordis, wasn't it? I wonder if the dragons are linked to Sanguis.