Mike son son Al

I don’t think we will have new Heralds, however they will all swear the fifth Ideal for their orders. As for being able to kill Heralds, that blade/metal should also be able to permanently kill a Fused. We also have Nightblood in play, which may be able to kill Fused, Heralds, spren? Shards?

I have a feeling “Unite Them” will refer to many different “Thems” over the course of the series. In WoR it was Alethkar and the Radiants, in OB it referred to Roshar and the 3 realms. In future books it can refer to the splinters of Honor, other cosmere worlds and shards.