Well, I guess I didn't read the post Vrel made here. But it is clearer on their blog post. Basically, it is a new Temple Trial you have to do which increases your rank among the members of the temple, graduating from being a simple initiate. Which, of course, grants you new tasks, bigger responsibilities and other freedoms in there (the main one being that you can treat the temple as a new home, too). Anyway, the trial is that you gotta endure a whole night doing a vigil (which means no sleeping, so be careful with your fatigue before doing so, because knowing how this game is...). So, yeah. Have fun with that.