Return of Reckoning

I cant use the Path Markers at the Hungerwind Path. The Quest Item in my inventory isnt usable either. Is there a specific order in which i need to use the Stones or am i doing something wrong?

The "Faith is Madness" epic quest has been bugged for months; I even reported it on the bug tracker, but unfortunately, nothing has happened so far. It’ll likely be the same story with this one—hardly anyone does it, so nobody notices.