The long-running Night Horrors series of supplements for the Chronicles of Darkness games is a series of fully statted-up NPCs for the different game lines, along with suitable supporting suggestions on their deployment and associated story ideas. Though each is linked to a particular game line and represents characters arising in that particular scene (so your True Fae needs are going to be served by the Changeling one and so on), obviously it’s entirely viable to take characters from one game line’s Night Horrors tome and have them show up in a different game line – say, if your werewoofles find themselves needing to get a favour off a mage, or if your hunters need a fresh nemesis after murdering their latest quarry.
Whilst most game lines got the Night Horrors treatment back in 1st edition, the line got revived for the Chronicles of Darkness era for game lines which either weren’t around back then or didn’t get any Night Horrors love. Enemy Action, then, is the Night Horrors book for Demon: the Descent, offering Demons, Angels, Cryptids, Exiles, and some cheeky mortal cultists to round everything out.
Neatly, for most entries the book doesn’t make assumptions about how you are going to use the characters in question in a game – as allies, adversaries, annoyances, or whatever. This makes for much better-rounded NPCs than if they were all intended to be allies or adversaries, since it forces the writer to think about questions like “What can this person offer their friends?” or “Why might PCs object to what this person’s up to?” It’s a solid concept for a supplement and a great addition to the Demon line – especially if you’re in urgent need of more examples of what Demons and Angels are actually like – and hopefully it won’t be the last one; it was the only Demon-specific product we saw in 2018, and 2019 doesn’t have any on the horizon based on the current Onyx Path Monday Meeting Notes.