So this is an Idea that has been bouncing around since my first read through, and is heavily influenced by
To start we know spren are bits of power, shaped by the cognitive definitions of physical realm inhabitants ( human, listeners, etc)
For the sake of this idea i will only focus on true spren ( bond capable spren) These spren are made from a combination of Honor and Cultivations power. Some are more honor, some are more cultivation.
Now with the Advent of the everstorm It seems Odium has greater ability to effect/ invest in Roshar. So his generals/unmade may all be made more powerful due to this advent. So Sja-Anat can now effect greater spren, spren with more investure.
So here is the question/ what i am thinking. Sja-Anat makes a connection between a spren and Odium, inserting his investiture into the touched spren.
In the case of true spren, does the touch of Sja-Anat insert odium investitures such that they are formed from the power of three shards, or does it replace the investiture of one of the shards, or both?
I can think of a number of questions id want to ask Brandon to see if we can start teasing this out, what does the shard think about this ?