LordJedue

@john203, thanks! Edit: Also, it was pointed out to me that Shashara is dead, and it's a final death since Nightblood kills on all 3 realms.

I don't think Azure is Vivenna. I think it's Shashara and she came back / worldhopped after death (for the second time, since she is Returned), sort of like Kelsier did in the Mistborn novels. Shashara would know the knowledge of how to make another sword, like she promised the Honorspen on Honor's Path. Also, Shashara is a known Worldhopper (http://www.theoryland.com/intvmain.php?i=1182#63) and is Vasher's equal / wife / one of the 5 scholars, so I think it's a more compelling storyline. Is there any hard evidence, comments from B. Sanderson that I missed that mean it's Vivenna? Edit: I am wrong. Shashara is dead, and it's a final death since Nightblood kills on all 3 realms.