Onyx Path and White Wolf before them have produced Translation Guides to allow people to convert characters and concepts between their various World of Darkness games and their Chronicles of Darkness equivalents – for example, if you want to use Vampire: the Masquerade setting ideas with the (generally superior) Vampire: the Requiem system, or blend ideas between the two, there’s a Vampire Translation Guide for you. Generally, I haven’t found them especially attractive; I feel like if I wanted to play or run some classic Masquerade, I’d be inclined to do it system warts and all, the effort required to convert everything not quite being worth the mild improvements made across the board.
The Demon Translation Guide, though… that’s a different matter. Allowing for conversion between Demon: the Fallen and Demon: the Descent, it’s an absolute godsend, because the original Fallen system was horribly broken – and whilst its supplement line did a hero’s job of trying to fix it, it’s still worth the effort to convert to the Chronicles system. In particular, there’s finally a system for determining whether your powers go off in their high-Torment versions by accident instead of the low-Torment versions: that happens if you end up getting less successes than your Torment score on the roll, but if you spend Faith in triggering the power, so long as you get at least one success on the dice you get to add the number of Faith points you spent to the successes total for the purpose of working out whether your Torment kicks off. This gives players a decent shot of having some semblance of self-control, at the cost of rationing their Faith a bit more (but then again Demon is a game which cries out for a brisk and active Faith economy to begin with).
Author Eric Zawadzki seems to have a decent handle on the virtues of both games, as well as how they’re played in the wild; for instance, in the discussion of converting Fallen‘s Apocalyptic Forms to the Descent system, he specifically assumes that the system for personalising one’s Apocalyptic Form provided in the Demon Player’s Guide are in use, and that system was so fun and such an improvement over the sometimes uninspiring off-the-shelf Forms in the core book that I suspect anyone with access to that book would be using that system.
The two Demon games have extremely different aesthetic takes on the topic. Whilst there are themes of espionage in common (which the book has some quite interesting ideas on teasing out), Fallen went very much for “Judeo-Christian demons emerge from Hell only to discover that God and the Angels have gone and aren’t coming back, and must deal with that”, whereas Descent went for “It’s The Matrix at its most Gnostic.” That filtered through all the powers. Providing a way to utilise the more classically demonic powers of Fallen in Descent‘s system means that Chronicles of Darkness users get to have their own equivalent of Demon: the Fallen on an aesthetic level, which is something I think Descent didn’t deliver.
Sure, the two Vampires and Werewolfs and Mages have different takes on the same stuff, but the vampires are still vampire-y in both, the werewoofles are still woofly, and the mages are still wizardy (if anything, they’re even more wizardy in the Chronicles version). Demons in The Descent just don’t feel very demonic, and whilst that game offers an interesting cosmological concept it doesn’t quite scratch the itch for playing “yeah, we’re Satanic fallen angels out to corrupt people’s souls”.