It is common knoledge that humans were not the origanal occupents on Roshar. But where did these humans come from? On Roshar there are glyphs such as; Shash, Shin, Khof, ect... But when I was re-reading warbreaker I noticed that when Siri started teaching the Godking to read she started with the letter Shash. It is my theory that humans on Roshar are origanally from Nalthis (Warbreaker siries.) Also it says in stormlight that when the humans came they brought their god with them. The entire magic system in Warbreaker is based on spoken commands or oaths... possible a connection with Honor. Lastly characters such as Vasher(Zhail), or highmarshal Ashur(Vivienne), or evan Nightblood, have been seen in stormlight. All known crossovers into stormlight have been from Warbreaker so it make sence for human life to be from Nalthis.
