[Rune Son of Bjarne]

I cannot remember what I initially thought this messenger was, probably a wring wraith, but I must say that I see no evidence for it.

Fell voice: I am fairly sure that the Mouth of Sauron was not very lovely to listen to, any human can have a fell voice

Hiss of Snakes: Now this is something that I assoisiate with the Nazgul, but I sertainly do not see it as proof! and it did only make people shutter, the Nazgul is known to have a more severe effect on their soroundings! And it was only those who heard him that was affected, not the people of Erebor in genneral. Like one can be moved by the words of another man, so can the appearance and sound of him make you shutter.

Heavy have the hearts: Yes of course! They stand between to opptions 1. the eternal wrath of mordor, or 2. betraying a friend. Who would not have heavy harts?

It could very well have been a Nazgul, but it might as well have been some sort of living messenger. Yes these things could indicate that it was a Nazgul, but for some reason I doubt that Tolkien would descripe a living messenger from Mordor as a real cheerful and lovely chap' !