I asked the following (from the big list of questions):
Me: he sphere which Gavilar found that Szeth now has--I've been lead to believe that it either is or was heavily invested
Brandon: Yes
Me: Is it still heavily invested?
Brandon: Yes
Me: So, it hasn't, like, gone dun or anything
Brandon: No, it has not
Me: And I'm going to take that to mean it wasn't invested with Stormlight--was it invested by Odium?
Brandon: Something like that.