Hey, is Brandon willing to tell us which universe Skyward is in yet? He said a while aback that it was in a universe (not cosmere) that he'd written before.
So, here's the thing--it's a pretty big spoiler. Meaning if you know the novella this is tied to (and it's one of the ones mentioned in this thread) you'll know a moderately large plot point in the book.
It's not the type of spoiler that will ruin a story--I do think some readers would enjoy watching how I lace them together. But do be warned that if you haven't read my science fiction novellas, and you hate spoilers, you might want to wait until Skyward is out to read them.
That said, if you know the terminology of the novellas in question, you'll find your answer in chapter seventeen.