the title kingkiller he either killed a king(i think he did) or somebody did[like ambrose]and fixes it so kvothe gets the blame, clue; the box has has one that cannot open, there is another one that he could not open. these are one and the same. both the maer and meluan are in line to become king/queen, it is not far removed the kvothe kills them for the box and finding out that they were the power behind the death of his blood family and ruh family. clue metal door with no key, there are tow so far the one at the school and the one that is spoken of by the white haired man with the cane with the wolf head.
i believe that if you pass thru them you are instantly there ands these posts that the ruh stop at are doors also.