Hey guys (this is my first post),
So when I first read Secret History, I noticed that those who are Cosmere-versed, being Nahz, Khriss, Hoid, the Elantrians, etc., call the bodies of the shards Preservation and Ruin Vessels. If you need validation, read the section where Kelsier infiltrates the Elantrians' base.
Anyway. Siri is called by the priests on Nalthis as Vessel as well. While this seems just like a derogatory term, I think it could mean a lot more.
I believe that Siri will ascend and take the shard Endowment. It sounds crazy and has very little concrete proof but I thought I'd post this and see if you guys had any thoughts. My theory is as follows:
We know very little about how the God Kings have been produced in the past. We know that they are babies who have been still born and have Returned. Or at least that is what we are lead to believe. We also know that the priests know a lot of things that they don't tell the Returned. I believe that Siri will either die or be severely injured in childbirth. This will also result in the death of her and Susebron's child. We have no idea how Returned can have children, as it is thought impossible during Siri's time, but it is because the Idrian royal family have Returned blood (Royal Locks). The fact that the child is half Returned will allow the baby to Return a lot easier, basically because it's already half way there.
We also know that there can be only one God King at a time. So upon Siri's death Susebron will try to heal her using his one divine breath. This causes his death, like the previous God King's before. And since his breath is so powerful, it basically causes a chain reaction throughout the vicinity, healing and reviving those in need. The plagues and disasters that were "prevented" due to the previous God Kings' deaths were coincidences or fabrications set up by the priests of Hallendren. This should not be surprising as they seem to have their own agenda, as seen in Warbreaker.
This leaves Siri to care for their child alone. Like Susebron's mother, she will care for the child until it is of an appropriate age to start ruling. Once this happens, Siri will disappear mysteriously, just like Susebron's mother. This will probably happen because the priests take her away. My guess is that she will be sacrificed to Endowment and the priests will increase he Connection to the shard. How? I don't know. Siri, still holding Susebron's divine breath, because without it she would have died, will give up the breath to her child, die and meet Endowment.
Upon dying, she will meet Endowment in the Cognitive Realm much like Kelsier meets Preservation. However, due to her increases Connection with Endowment, the shard will end up giving the power to Siri.
While it may be unclear as to why the priests of Hallendren would want the body (or Vessel) of Endowment to change, remember that the shard's intent influences the holder quite a bit. The longer they hold it the more the intent has control over them. For example, in Secret History, Preservation points out that Ati could control Ruin's intent a lot more in the early days, and has essentially been consumed by it. If the wielder of Endowment were to be consumed by the shard's intent, it may just give the power to everyone on the planet, essentially shattering the shard. The priests know this is a bad thing to happen (Elantris basically has no shards cause they were shattered and they aren't exactly so well off). They try to replace the shard as frequently as possible without being suspicious.
I know I made a lot (and I mean A LOT) of assumptions. But I think it has some basis. Maybe this won't happen exactly in this manner but I think the main point--that Siri will ascend and take Endowments power--will happen.
I have yet to ask Brandon about his use of the word Vessel. Next time I see him I definitely will.
Any thoughts? Is it complete crap? Or do you think it has some justification?