Hi there,
during Dalinars vision in the purelake he sees thunderclasts. They are made of spren that inhabit stone , as far as I understood it.
I got reminded of the reshi Islands/gods, that are very huge, stonelike beings.
I wonder, if those Islands are thunderclasts/voidbringers, that only wait for the Everstorm to Change them. If so, poor inhabitants of the reshi islands , if not, sorry for overdoing the theorizing.