Yata

There is a WoB about that Adonalsium's enemy biult a weapon. But we don't know if the weapon caused the Shattering or if it is used at all.

Well Jasnah spent time in Shadesmar. She may discovered very much about the Spren-bond. Maybe also from ancient Radiant Spren with Memories of old Knight

Sorry I suppose to have explained myself bad. While Kelsier and the Tanavast cognitive shadow are the same. To me there is a great difference about this two Shadows to be a Slivers. Kelsier's Shadow took Preservation for some time and then release it. This give him some residual Preservation's power and made him a Sliver. The Stormfather is the Shadow of someone who held a Shard, the Tanavast's Shadow never held the Honor's Power and to me it's not a Sliver. This is what I wanted to say. That we don't know if the Cognitive Shadow of an Ascended One is a Sliver as Heritage or not.

I don't know if a cognitive shadow of a Shardholder may be considerate a Sliver.

But also if she lie. I don't see the meaning of giving away your breath to someone who has managed to live for centuries (getting enough breaths) without help.

If Szeth are going to became a Skybreaker (as RK of that order) giving Nightblood will be meaningless. Therefore I really doubt that it is the case. And I really doubt that any kind of Spren will bonding with him while he has another bond with "something oddly" like Nightblood. For the other options I will choose the Squire one, Szeth will became a Squire of some Skybreaker (I am not sure about "herald's squire") mixing the passive Stormlight ability of the Squire with the peculiar ones of Nightblood. This will result in a Pseudo-radiant.

Well if the main idea falls this Twinborn may be a decent (but with short live) Ghost Rider (but in this case a "Ghost Runner") XD

Your Idea works also without an "Adonalsium holder". If we think at Adonalsium as a "Galaxy-wide-shard". It may influence the entire Cosmere like a shard influence a single Shardworld. Without any Holder he begin to develop a sentience (that probably develop before to create everything) but without any active Intent he would probably be a passive force after the creation of everything. Everything allright until the things on Yolen went really bad and the Yolish in front of a Unamed Calamity decided to take the Colossal-Power to avoid Something. In this view maybe the Shattering was made because the "Aphaty-Intent" of Adonalsium will stop everyone how took the powers to do anything with it.

To me, as far as I can understand of the Metalmind's key and Identity. Twins have a likely chance to be "metalmind-compatible"

Well Jewes say that she give his Breath to the God-King when she was a child and she was quite proud of this.

Maybe the "identity" is just a "print/photo"-like of your spirit-web.

or to bring to you things that another awakened object push away from you.

Without Ruin, Ati's Soul will slowly reverts to his original personality (at least the big part)

There is a recent WoB about the Stormfather and his strangness. https://www.reddit.c...1?context=10000 Q: We know that the Stormfather is a Cognitive shadow and is also acting as a spren for Dalinar but is he able to do that because the "unusual sequence of events" took place or is there something else going on specific to the nature of the Stormfather? A: RAFO.

@DSC1 Syl became a Shardblade after the third oath not the second. And about Shallan ans his progression, I suppose that you confused things a bit. Shallan before killing his mother has advanced far into the Lightweaving (at least the third Oaths/truth) but for the Trauma of killing his mother she suppress his bond with Pattern. When years after Pattern return to her, the bonding return like it was (or maybe also further). There is a WoB stated that Shallan at the end of WoR is above Kaladin as "RK Progression" and therefore is a 4-Oath-RK (because I suppose that she isn't a full RK)

Also the Small Aons didn't work without the new line.

Yeah but this works because she may "burn calories" to get Stormlight (from uknown source) like an Allomancer burn metals as a gateway to Preservation power. It's quite different from "Compounding Breaths". There isn't any kind of trasformation from Preservation's Power to Endowment power here. Because the calories would vanish and return to Preservation (as Investiture)

I remember that the final destination (not the movie) of souls is beyond the reach of a Shard (Sazed says something like that). Therefore something like Vin or Elend resurrection is quite impossible, I may believe in a Kelsier return to the living. But just because he is avaliable.

Probably without Shaidar haran the took of the Dark One into the world would be less strong. Shaidar Haran was an Herald for the Dark One, that at the begininng works as Agents and then give birh to a true "entrance" for the Dark One to the World. If the Dark One wasn't seal soon, we don't know what conseguences this "entrance" will produce. We can't judge his role just because his purpose in the end was avoid.

About the "problem" with Cognitive Shadows, Spren and Aons I just saw that Brandon answered me (Thanks to Argent to made me check again) and he want write Seon not Aon. https://www.reddit.com/r/Fantasy/comments/3va8fw/day_4_group_ama_in_support_of_worldbuilders/cxnjssn?context=10000

Mmm Young Bard I don't think. The mould seems to be a simply fungus, without anything magical. Without the new line the the Aon Ela has no function at all. I was thinking that maybe it may be another boost for the AonDor for the Hard Time. That concentrate more Dor on Elantris from the country. Or maybe It's part of the "plan to rebuild the Shard" that someone has thought time ago.

it would be wonderfull. But you have to choose carefull the words, for example not "shattered" but "splintered" and I don't know if there is something else to watch before submit the question.

Maybe to the true "merging" it takes a very long time, and Harmony is still "borning".

But at the end of HoA is stated that Sazed keep the 2 power separated. And now Harmony has "two set of power" as if He has both Preservation and Ruin not a new "shard".

My theory was about the "Devotion and Dominion that now are actually a unique Shard" (that was frendly called "Unity"). The Fact that Sel has one single System may serve as "proof" that now there is no more Devotion or Dominion and the Dor is a new (and Single) Shard-Entity.