SZETH HAS NIGHTBLOOD?!?!?! (seriously. this is a big deal. possibly the biggest deal in the whole book)
I don't know why we aren't freaking out about this more... Nightblood is on ROSHAR. that menas the freaking Heralds have been worldhopping.
What the HECK happens to a sharblade and nightblood when they meet?!
And if it is a live Shardblade, like Syl and Pattern... Would there be a difference? When Szeth said he didn't have a Shardblade, Nalan threw him Nightblood.
Also, in Warbreaker, anyone who held Nightblood ended up killing themselves. Casher was the only one to unsheath the sword, and Nightblood (quite quickly, might I add) consumed Vasher's Breath. So what happens to someone on Roshar, who presumably, does not have any Breath weilds Nightblood the same way Vasher did?