Carnymancers have Medium Awareness
They know Erfworld is just a story. They know it’s being written by Rob Balder, the Titan. They know everything is a show, and the show is being put on for us, the audience, across the Fourth Wall
. That’s their secret.
They can’t tell anyone because, well... if a Carnymancer, in-story, told anyone this is just a story
... that would instantly end the story
, because we the audience would also learn it, dispel the mystery, lose interest and turn away.
Perhaps towards the endgame Rob pulls a Grant Morrison and gets Charlie to tell Parson the truth, and no one else, as a plot point
; as that would be the only way to get away with it, because it would be actually contributing to the story. The show must go on
, they know that.
Carnymancy’s power is not breaking game rules so something can happen. It is the ability to make anything
happen without a reason, anything at all, if it advances the plot
without breaking our Willing Suspension of Disbelief
. No explanation given.
Just like in stage magic, our belief is the limit of their powers, and that’s why they’d never tell how they do it. As long as we keep coming here to speculate what the exact mechanics of Carnymancy are, they’re home free. If we ever realize there are no mechanics
… they’re doomed.
(On a side note: I don’t think Signamancers are aware of that, at least not as wholly as Carnymancers. They do realize nothing is real, all things are just a show of everchanging appearances, illustrations that fit a story. But they can’t see the story. Carnymancers can.)
“Run this same calculation ten times in a row. Go.”