on page 1064, chapter 88, The Herald Nalan gives Szeth a black sword in a metal sheath with black smoke coming out of it which says in his mind: "Hello, would you like to destroy some evil today?" sounds a lot like Nightblood, doesn't it
In chapter nine on page 129, reft says to the new recruits in the chasms: "Take a good look lads. This is where we come from. This is why some call us the order of bone." But it's never mentioned any other time in the entire book. Why?, isn't that Dakhor Monastery in Elantris?