Graves and spirits?

[Sleipnir]

I'm not sure what I'm missing, but I don't have the option to create other graves apart from the modest one. According to tooltips and forum comments, there are supposed to be other variants that also spawn different spirits?

Is this still part of the game? If so, what do I have to do?

[Philtre]

As of a couple of versions ago, the other graves and their corresponding ghosts were removed, and the mechanics they supported were reworked. You can now get lots of smokepearls from the crystals exposed by pushing back the fog, and treat people with combat-related debuffs at the medical beds. So now the Founders' Ghost is the only ghost you will ever have. (On the plus side, they have extra utility now.)