The Multiversal Network of The Calling

[The camera first focuses on Katherine's rather unimpressed and exhausted face.]

How am I supposed to understand most of this when it doesn't even cover a single thing I recognize? Blood, I know, everyone knows what it is and that it keeps us alive and losing it is very bad, but-...

[She turns the device around, and the image resolves from the blur of sudden motion as it auto-finds a stack of three medical books, ranging in target readership from roughly ages eight to twenty.]

But all of these break blood down into these...cells and things. What are these cells supposed to be? And phlegm and bile come from entirely different places and-...

...why does none of this so much as mention effects on temperament?

[The feed goes dark as the device goes face-down on the table, and judging from the sounds of it, Katherine's rested her head beside it. Her voice is muffled, in this case by her arms.]

Am I poking about in the wrong direction? Should I be looking at magic instead?

[At first, the wrong camera turns on, showing the book Katherine has laid out on the table, pages bathed in sunlight from a nearby window. It's nonfiction - biology, in fact, and its target audience likely in the young teens crowd. The open page displays a labeled diagram of a strand of DNA and a Punnett square with an explanation in small print, courtesy of a cartoonish character sitting on its corner, clearly drawn by an adult attempting to appeal to a younger crowd they only superficially understand. The normal-sized text at its side explains hereditary traits, with a side of how DNA determines everything about a person's appearance. It's helpfully colloquial.]

Well, I can't say I completely understand all of this, but- oh, wait, I've got it the wrong way, haven't I?

[She switches to the front camera to show her face instead, bags under her eyes indicating a rather long self-imposed study session. She raises a mug of something no longer hot enough to require one to her lips and sets it down offscreen with a gentle thunk. The window beside her reveals the skybridges, flying cars, and gleaming metal towers of Tomorrow, from several stories up.]

There we are! Now, as I was saying, am I right in guessing this means the...the essence of who we are is in...all of us? Does that mean spells that require a bit of, say, hair, from the caster have worked on the same principles as blood magic all along?