No, not the adventure of that name but a series of rules to handle situations where adventurers have the corpse of some mutated rat and insist it's a "rat man, a skaven!" Rules that work towards keeping the "truth" suppressed. Borrowing a bit at times from Cthulhu concepts (skaven are like the mythos).
Everyone knows there's no such thing. Extra challenge die on all attempts to convince/motivate based on "the rat people are doing it etc. etc." - e.g., " you must send soldiers, the skaven are going to attack ", " don't eat it, the skaven have poisoned it! "
You know what you're saying can't be true even as you're saying it. Suffer 1 stress every time you proclaim "it's the SKAVEN!" or similar to anyone who doesn't share your mad belief. Add following to all such rolls: comet - you get used to this difficulty and can ignore it in future.
It's awkward being around friends with these delusions/who don't admit the truth. If everyone in a group backs a declaration (takes 1 stress), okay but if everyone doesn't, then increase Party Tension +1.
One of Us, One of Us. Admitting you were wrong is very destressing. Automatically reduce stress by 1 and make a Discipline check as when rallying for more reduction if you openly admit your foolishness/error.
Any comments/alternatives?