no question specified
The “how-did-Vasher-get-to-Roshar” thing will be explained. For now, we know that Vasher got tired of “sucking souls” and, through previous study with a group of scholars, knew how easy it was to get Investiture on Roshar (same way he knew what a Shardblade was so he could try to replicate it (and we all know how that turned out: Nightblood)). With this same group of scholars, he figured out how to get into the Cognitive realm.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.