One of favourite
Spirit cards. Keep in mind that it doesn't let you cancel peril, surge, etc., but it lets you immediately cancel the when revealed ef- I mean, er, the revelation effect of a really nasty treachery at just the right time. It can, however, deal with surge that's part of a treachery's revelation, like False Lead.
It does nothing against cards that do not say revelation at all (like most enemies). Still, it's an amazing card. Grab this and hope you won't have to use it. For 1 exp, the extra security is totally worth it.