So my friend was looking through his grimore cards and there was this card that was Eris and Toland talking and Toland said something like in good time young Titan so Eris is probably a Titan. It just goes to show bungie must favor Titans because Xur favors Titans a lot. Or it could be the fact that Titans are super unlucky except for a couple hundred thousand Eris probably collected armor and class items from her fallen comrades