Neither Hierarch, Heretic, Renegade nor Guildwraith, Freewraiths are those who disdain - or were cast out from - the other facets of Wraithly society.
They constitute a majority of minorities: child ghosts, wanted "criminals," rejected Heretics, abandoned Renegades and those who decided that whatever they were in was not to their liking, and the other alternatives weren't so great, either.
Together, these varied hands scrape an existence under the noses of the others, banding together for shared protection and company or remaining alone and aloof.
So come on down the stairs and share in their secrets, if you're the right sort of person to do so.
But be warned: they know their own, and some secrets are worth killing for...