So as not to further derail the discussion of Blood of Shadows in its own product thread...
What is the best way to approach Blood of... products for changelings, vishkanya, and kitsunes? Ideas so far:
...Changelings are my all-time favorite race - they practically got me into Golarion. I adore them. But a 32-page changeling-only book would be overkill, in my opinion. Same for strix, or grippli, or (I'm going to be murdered for this) vishkanya.
I think this book could be on the right track, if it avoids the pitfalls of Elements and Night. Don't make it a gazetteer of locations, or a guide to playing monster races, or a grab bag of random options for just anyone. Tell us how these races live, give each of them some solid attention. Above all, stay focused.
...Blood of Deceit: Changelings, vishkanya, and kitsune. Three races is a big split - keep it focused!
Not to nit-pick, but can it instead be named something like Blood of the Cunning? "Deceit" implies an innate distrustfulness and deceptiveness in these races, which bugs the hell out of me.
I won't tell you not to be bothered by it - that's not illegitimate. The problem is, "distrustfulness and deceptiveness" seem to be in the nature of the listed races, to a major extent.
Changelings, especially the green widow (which the fluff seems to paint as the default), are literally creatures of deceit. First at conception, again at the crib swap, and seemingly throughout their lives.
Vishkanya and kitsune both have available racial traits focused on disguising themselves as human. Existing vishkanya options are almost myopically focused on that one idea. Kitsune are painted heavily as tricksters and deceivers as well.
Maybe I'm reading too much into things... but I think of it as tiefling-esque. You can play a tiefling paladin, but you're playing against a stereotype. Nothing wrong with that.
Both names (Blood of Deceit and Blood of the Cunning) are sort of missing the point of the brand name, however. Aasimar literally have the blood of angels. Tieflings literally have the blood of feints. Vampires (and dhampirs by extension) are commonly referred to as "creatures of the night," so they both literally have blood of the night. Skinwalkers' blood is tainted by lycanthropy, which is triggered by the moon, so they literally have blood of the moon. And geniekin literally have blood of the elements.
Deceit and cunning don't have that level of connection to a "thing" that connects the races together, because when you get right down to it, all of the aforementioned races are connected by some sort of communal blood heritage; they're suffused with or by something.
If Paizo wants to say that kitsune are officially fey-descended (which I'm sort of "meh" about), then Blood of the Fey could work for them. But Blood of Deceit / the Cunning doesn't fit the naming scheme, and naming is EVERYTHING when it comes to a brand identity.