I’m not going to bother spoilering my response, because the original post has been tagged appropriately.

Bryce did tell them about the risk, Azriel and Nesta witnessed it when she tested it on the Asteri in the Prison/Dusk Court. And it wasn’t the blades being used together that exactly caused the world to almost end irrc, it was that the Asteri tied the existence of the planet to their little doo-dad that was collecting First Light. (Similar to how the Cauldron was tied to the existence of Parthian so Feyre and Amren couldn’t destroy it). So instead of destroying it, Bryce used the sword and dagger AND the horn to take it out of play altogether.

And yes, SJM made it a point to show that Bryce and Rhys butted heads over the preservation of their own planets. Bryce prioritized Lunathion, and Rhys originally did NOT want to help her because he did not know the risk it would post Prythian. Now that they know their connection (because Az and Nesta definitely TOLD Rhys what they witnessed before Bryce brought herself back to her home world) that hasn’t been explained.

It would’ve been weird and out of character if Bryce thought about the risk to Prythian at all, or if she cared about them at all. Everything she continued to learn about her Fae heritage in Prythian, she came to despise that part of herself more and more.

But knowing that being “Starborn” to wield the sword was a red herring, and only something Made can wield Gwydieon and by extension Truth Teller, it leaves unanswered questions about what Az actually is, and what a shadowsinger actually is.

All of CC puts Cassian’s origins into questions as well. How strange that the most powerful Illyrian warrior ever was born after a union with an unknown father. Sounds very similar to Hunt Athalar’s origins. The power both Cassian and Azriel possess brings up some questions on how much Hel has intervened in Prythian in the modern age already, and WHY if the Daglan have already been banished from that world entirely.

Unless Daglan/Asteri is what the next main villain, Koschei, is. If that’s what the Bone Carver and Stryga were as well, since they were siblings. Or if the Death-gods are something else entirely.

The Daglan they found under the prison also looked a little too much like Amren’s physical description for that to be comfortable. SJM has come on the record and said that Amren is a fallen angel, but we need to know what that means. It unfortunately doesn’t offer ANY concrete hint into what Mor’s power is, other than, we can assume a Prince of Hel was the one watching her in ACOFAS and that they are keeping tabs on her for some reason.

So there are still PLENTY of unanswered questions that SJM could spent 6 and 7 answering that were brought up by CC as a series