Subject: And yeah, that absolutely applies to tech, too.
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Posted on: 2017-10-30 13:07:00 UTC
My NaNo last year both succeeds and fails at this: a chunk of the plot is about figuring out what this new piece of technology can do, and I then make use of the details to make the finale work. (Being NaNo, obviously it's still pulling things out of nowhere at the last minute...)
Sanderson discusses Tolkien, and I think the tale of Beren and Luthien is a useful example of 'hard' magic. Luthien shows off her key powers - enthralling people with song (to Beren), shapeshifting (lengthening her hair), and bringing sleep (with the nightcloak) before she even leaves Doriath; she then proceeds to use those three powers pretty much exclusively through the rest of the story. Nargothrond? Put it to sleep. Tol Sirion? Knock Sauron out a bit with her cloak (then borrow his magic for the rest). Entering Angband? Shapeshift into a vampire and put the Wolf to sleep. Stealing a Silmaril? Enthrall Morgoth with song and put him to sleep. Then we have some generic healing (which she already did for Beren after rescuing him), and... nothing else until she's enthralling Mandos with her song.
If we didn't know that Luthien's song was captivating, her using it to overcome Morgoth would be a weak resolution of the plot (especially if we also didn't have the duel between Finrod and Sauron to look at). But Tolkien introduced it early, used it repeatedly, and gave it a firm place as a part of the magic system.
Contrast with Gandalf, whose powers are (as Sanderson says) very loose. He can fight stuff. ... yep, that's about it. And the biggest things he pulls off with that? Knocking a Balrog off a bridge, making an already-defeated Saruman a bit weaker, and rescuing Faramir from the Nazgul. The plot is never continued by 'oh, btw, Gandalf is strong enough to just beat this'.
~
The one place I disagree with Tomash is 'you just need a line or two that somehow establishes how the power goes and doesn't go, preferably before it becomes super-plot relevant'. That's Tell, Don't Show right there. ^_~ Far better would be for us to see how it works. In a movie, you might demonstrate that vampires don't appear in images by cutting from them robbing a museum (say) to a shot on the security monitor of the exhibits moving by themselves. In a book, you could clue it with your human character noticing that there's no photos of Secret Leah Vampir in her flat, for instance. It doesn't have to be explicitly stated with a waving flag; you can allow your audience the satisfaction of piecing it together.
hS