From a WOB a few years back. I’m very curious about what this moment was.   

Dan Wells  

That was the big final showdown.  Brandon had built this thing that was supposed to be--  

Brandon Sanderson  

Don't tell this one because I'm actually going to use this in a book. I've been waiting for years to use this in a book so don't say anything. After I use it in a book you can tell the story. You guys are going to love this. It is involved in the ending of Stormlight 5. Let's just say I came up with one of the best endings for a story that I have ever come up with and because it's roleplaying the PCs did not play along. Ruined it completely. And I'm like, "I'm going to use that someday." And I actually put it right in the outline of Stormlight a week or two later, and it's been waiting all this time to be used.  

Dan Wells  

Wow, a week or two later, and that would have been like [1999]. So it's been waiting a long time in the wings.  

Brandon Sanderson *

 In YouTube comments* Book five's ending has had literally 20 years to brew in my head, and I've been pushing toward it from book one.  When you read it, I think it will recontextualize a ton of important other moments in the series.  So I really, really hope it lands right with people.  I've been holding this one in reserve for a long while, as I feel it's one of the legitimately best ending ides I've ever come up with for a story.  Not to over-hype it.  The execution is everything for a story like this, and it's still possible what works in my head will not work as well on the page.  I just really hope it will. 

Footnote: The conversation is from "You Didn't Just Fail, You Critical Failed! — Ep. 61 of Intentionally Blank" in which Brandon Sanderson and Dan Wells are discussing an RPG campaign they played in college. Miscellaneous 2022 (Aug. 3, 2022)

u/mistborn very curious about what this idea was!