Hey all, first-time poster, but I had a theory about Spren and the 'Secret that broke the Knights Radiant'
So, on the back cover of WoR it says
"It is the nature of the magic. A broken soul has cracks into which something else can be fit. Surgebindings, the powers of creation themselves; they can brace a broken soul, but they can also widen its fissures"
And somewhere in WoK or WoR, it says that the number of people who bond with spren increases right before a Desolation.
Think about this for a second; The people we see in Dalinar's Vision of the Recreance (Windrunners etc. abandoning their oaths and shardblades/plate) were full knights.
Kaladin, after swearing 3 ideals, gets to use Syl as a Shardspear/weapon. We learned that all shardblades are spren, living or dead (excluding blades like Szeth's)
The question is, why would these Knights, who had bonded with their spren, probably having a good relationship with them like Shallan/Kaladin have with Pattern/Syl, abandon their oaths, KILL their spren buddies, and walk away? What IS the secret that broke them?
Here's where theorizing comes in.
We know that a person has to be 'broken' to allow a Nahel Bond (see back cover quote), and that more people bond to spren before a Desolation.
Chances are, people aren't suddenly becoming more attractive to spren.
I think the spren, acting on their nature left from Honor's splintering, believe it to be honorable to save mankind by giving them surges. To do so, they are forcing bonds onto people.
Example 1, Shallan. She was terrified by the symbol-headed Cryptics that followed her around until she said her first truth and went into shadesmar (soulcasting the goblet). I realize she had already bonded partially, but I think that her broken household may also have been inluenced by spren or some other force (Her father's hate is unnatural, don't remember the WoB, but I know he said it wasn't just him)
Example 2: Jasnah. In the beginning of WoR, she's freaking out about the whole 'backwards-shadow' thing. Then, abunch of spren attack her, forcing her into shadesmar, where she fights back, and eventually bonds with Ivory. This, to me, is the most overt example we have of spren forcing a bond.
Example 3: Lift. She grew up in Rall Elorim, City of Shadows. I think we have further WoB somewhere saying that there is some nasty spren-like stuff going on there. Furthermore, Wyndle says this
"I wanted to pick a distinguished Iriali matron. A grandmother, an accomplished gardener. But no, the RIng said we should choose you. 'She has visited the Old Magic,' they said. 'Our mother has blessed her,' they said. 'She will be young, and we can mold her,' they said." emphasis added
Example 4: Kaladin. I think this might actually be the odd one out. Syl left, she said, without permission from the honorspren leadership in shadesmar. She truly was simply attracted to his honorable life.
Finally, we know from Jasnah's return at the end of WoR that the spren in shadesmar actually have civilization. "It's been a long time since the spren had to deal with someone alive" pg 1078 and also the earlier quote from Wyndle. It's been mentioned a couple of times in the books that spren want a bond with humans because it gives them intelligence. But, they have civilization in shadesmar. they already are intelligent. So why do they really want the bond?
Feel free to rip it to shreds