Once upon a time, there were a bunch of PCs. They were either very nice people, or very, very bad people, but their morals aren't important right now. What is important is that they got their hands on a standard MacGuffin: the usual choice is an old book or map, but really it could be anything. A mosaic would be nice, but then the PCs would have to be in Europe.

Well, they'll be going there, anyway, so let's call it a mosaic. Said mosaic was just uncovered in ... well, Pompeii is mysterious enough, and your players will know enough about it to nod their heads wisely, at least. This mosaic shows a Roman holiday scene, complete with a priest and a ram, apparently sacrificing to the Roman god Janus (oh, no, not that base canard again)... and what very much looks like writing in Angelic, worked into the background.

How odd.

Now, it's best if the writing isn't part of the news story, so have a Soldier of (insert friendly Superior Word here) on the case: he can't actually read Angelic, but he can recognize it. Of course, he makes darn sure that the photos of the background don't become part of the official record. Using Standard Stock Method for Getting to the Point #5, the photos end up in the PC's possession, and the Soldier is nowhere in sight. Suspiciously nowhere.

Assuming that even demons can read Angelic (and why not?), the PCs have got an eyeful. It would seem that Janus was a bad boy after all before the Purity Crusade: why, he was siphoning off the Essence, according to the inscriptions, which seem to detail a series of prayers apparently used to summon him. Well, it's all very coy, talking about "sweet Wind of Change basking in our love" and so forth, but we know what's really going on, right? There's also a bit of Latin graffiti included in the photos: apparently, the local services seemed to take place in a cavern not yet dug out by the archeologists. The words "gold", "silver" and "god-weapons" are prominent.

Now, any smart angel would take all of this to the nearest Tether and send it up to the Inquisition, not grab some shovels and go look for old artifacts (and other useful blackmail material). Perceptive angels would stop and wonder why anyone could write this down in Angelic if they couldn't read it, or why the Soldier disappeared. Experienced angels would realize that the digs at Pompeii were finished quite a while back.

Still, when the PCs get to the cave, you should at least give them the chance to try to explain why they haven't really failed the test of subordination so carefully set up and administered to them by the Inquisition. Having Dominic himself there looking annoyed is cruel, but understandable.

And, oh, yes, Asmodeus knows about this little trick, too. He just doesn't care: any demons this impetuous deserve to be shown the error of their ways by the Host...