Throughout vanilla, the Dark Below, and the House of Wolves, dead Ghosts have been scattered across our planets containing information and historical data about our universe. On the Dreadnought though, where no Guardians had been before, Calcified Fragments hold the stories of the Hive legends and Oryx's own past. Well, we know that the Iron Lords set out into the Plaguelands, but all their Ghosts returned to the City. Why? Guardians have died because they were separated from their Ghosts, likely when the Ghost was drained of it's Light. But all the Iron Lords Ghosts returned intact. Now, maybe other Guardians have been in the area before, and their Ghosts might be there. But why didn't the Ghosts of the Lords die? The Lords are quoted as "sacrificing themselves", which means they are dead. So, if the Iron Lords Ghosts are not in the Plaguelands, who's are? And why did the Ghosts return to the City, only to clam up and not reveal anything about why the Lords never returned as well? Here's a theory; what if the Iron Lords had to separate themselves from their Ghosts? As for what could possibly drive the Lords to perform such measures...? Well, I got no clue. But do you? Important Edit: At the time I wrote this, I was under the impression that Jagi had led a host made up of Iron Lords. But after checking my research I found that I had made an error, and the Ghosts I mentioned that returned were not connected with the Iron Lords. So it is possible we will find the Ghosts of the Iron Lords in the Plaguelands, but I don't expect to see the Ghosts of other Guardians as the area has been quarantined since the Iron Lords. Sorry for the inaccuracy of this article.