iv'e been thinking about an adventure in three or more parts wherein the players battle a tzeentch cult who are looking for an ancient puzzle which one way or another winds up in the players hands
the object would be a seemingly unsolvable puzzle cube which i will impress upon the players is instrumental in thwarting the plot of the cult's patron daemon
now, what got me excited to write this plot arc is that the puzzle becomes easier once the players understand it has something to do with the concept of empathy, sort of a so simple it's looking you right in the face thing, but something only a human could understand, not a daemon
and the way i want to get this across to the players is letting them know there is some big secret about the puzzle and there are clues in the adventure, there would be no truly evil villains besides perhaps the cult leader and this daemon enacts his plan through callus mortals, say in the hive city where they are tracking down the cult signs of warp corruption are obvious in apathetic uncaring imperial officials who overlook the cult's activities and say a resolute caring priest trying to help the people remains pure, it's a bit of a raw concept at this point but that's sort of what i'm going for,
and of course managing to solve the puzzle will save the city from a heavy handed response by the ordo malleus but they can't let the cultists deliver the solved puzzle to the daemon,
it's a work in progress but what do you guys think?