Questioner
Spren. The phenomenon that creates spren. Is that Roshar-specific or is that a general effect?
Brandon Sanderson
Well, yes and no. So the question is, the effect that creates spren, is that Roshar-specific or is it general. The general fundamental rules that create spren are cosmere-wide. Spren are pieces of Investiture, usually pieces of Investiture that come straight from one of the Shards of Adonalsium, split off in some way, that because of human or other sapient creatures thinking about it or interacting with the power, the power starts to take on a life of its own. Develops personalities and comes alive, so to speak. And this can happen on any pla-- in any place where there is Investiture. So it could happen on any planet in the cosmere with significant amounts of free Investiture. The places you've seen this happen most commonly are on Sel and Scadri-- err Roshar. You haven't seen it on Scadrial, and you've seen little kind of hints at it on Nalthis, but not quite. And so-- But it's possible for it to happen anywhere. Seons and spren are basically the same thing with different powers-- powers kind of pushing them in different-- growth out of them-- That said, the non-sapient spren, so the spren that are not quite as-- They're not going to stand up and talk to you. Those all existed-- not all, but most of them existed on Roshar before the Shattering of Adonalsium.