I think they are just doing the astrology thing where you leave hints and guess so generic that can fit anywhere, but.... I kinda really like to theorizeLet's say that all this old god conspiracy is true; N'Zoth would know us in the Chromie quest just cause they can see all possible timelines, and if I have to guess I would say the player is pretty important in many of them since the first ones' device reacted to us; so we are probaably pretty important on a cosmological level not sure how. So in my oppinion this interest of N'Zoth in us is pretty much cause we are the ones that can give a definitive victory to one of the cosmological forces. This could also be cause we are basically the champions of Azeroth, and we have been hinted that Azeroth might not be a titan, but maybe a first one (?). Maybe old gods need us to deliver the final drop of corruption into Azeroth.Then the dagger, I am pretty sure they wanted to do more with that and they just didn't (just like with the Jailer), or is just a cheap way to bring back N'Zoth if they wanted to (just like Denathrius scaping inside Remornia); but let's assume this is planned. So I would say that N'Zoth did intentionally die, he left that dagger there on purpose; but why though? Maybe he wanted to be free but remain hidden, maybe he needs to be in Xal'atath for some reason. Maybe Aszhara did not even betrayed N'Zoth maybe even that was planned. The line:
