AbdulAlhazred
Legend
Ummmmm, its pretty loose. There are what are called 'Forgotten Gods'. Basically Doskvol and its world are a post-apocalyptic magical hellscape that is, effectively just a passing phase on the way to the final ultimate end of the world. Obviously you can play this up or discount it, nothing is cast in stone. What we do know is that the Sun was destroyed, there are only a few shards remaining, and the world is shrouded in dark/dusk, aside from the unnaturally huge Moon. When the cataclysm happened the Gates of Death were broken, and the ether, or ghost field, permeated the world. Any time someone dies, their spirit wanders the land, unless the Spirit Wardens collect them and dispose of them, which they do with a fair degree of efficiency. Doskvol itself, and all other remaining cities in the Imperium, are surrounded by lightning barriers, which keep the most potent spiritual manifestations at bay. Outside of those barriers, are the Death Lands. Few living things exist there, and special equipment is required to work and survive. There are spark line trains which connect the various cities. The whole thing is run by the Immortal Emperor, a wizard of immense power.Out of interest since it wasn't clear in the reply and I got curious when you were referring to the game's mythos, is BitD set within a fantasy setting that includes God's and magic and supernatural creatures?
The oceans no longer really exist, they are replaced by a 'void sea', a star-filled black surface upon which leviathan hunters sail, hunting the leviathans who's blood is distilled into electroplasm, which fuels all the magitech of Doskvol, including the lightning barriers, which are run by the Sparkwright Guild.
So, the Forgotten Gods have, apparently, no real power, though they may or may not be actual divine beings who can perhaps create a pathway back into the world. They were worshiped in ancient pre-cataclysm times so maybe they are/were real? There are also supposedly 'demons', some sort of spectral beings of great power and malignity, possibly. Ghosts obviously exist, and humans can attune to the ghost field in order to interact with all these spectral phenomena. You can capture ghosts, place them in 'hulls' to create animated magitech beings, etc. There are also other types of creatures, such as vampires.
The upshot is, magic is a pervasive part of life in Doskvol, powering its street lights, trains, lighting barrier, and probably some other stuff too. Any character can attempt to attune to the ghost field and perform 'magic'. There is alchemy, ritual magic, spark craft, etc. which any PC can try to use, though Whisper is the playbook specifically designed for dealing with things like ghosts, and Leech is specifically a sort of alchemist/artificer type. Doskvol is a pretty 'magical' place, so my guess is that pretty much any successful crew operating there is going to employ at least SOME arcane techniques. The game I played in delved pretty deeply into the arcane, especially when we got to tier 3 and above. At the end of the game some of the characters were teleporting, manifesting demonic abilities, etc. I think my character was the MOST mundane, he killed off the demon that was haunting him, but he did have a sort of half-demon girlfriend... Mostly he stuck to "I kill it with my sword" but he could do things like grab or attack electroplasmic/ethereal entities and such, even though he couldn't attune worth a damn.