EDIT: only after I hit the "post" button did I realize what a novella I managed to put together over a few days on this subject. So in the interest of TLDR (you can read the details below if you want): Luesh is the source of all the info Shallan and her brothers had about where the Soulcaster came from, and that it was now broken. Luesh was involved in coming up with the idea of Shallan seeking out Jasnah. Kabsal's plan to kill Jasnah in Kharbranth would only ever work i