Amariah fetches down their alethiometers.
"It's about time I took care of Alethia's afterlife, whatever it may be," she says quietly. "What can the alethiometer tell you about what I'll find?"
Are they going to - starve, or anything? Amariah asks. Do I need to fix this thing to provide them with angel food cake or something?
They'll get uncomfortable after long enough without food, says Kas. The Authority's special somehow, maybe because he's so old. It doesn't much matter what food, though, and they don't need a lot or anything. You could totally give them a thingy that dispenses unlimited angel food cake and that'd keep 'em.
Amariah designs a little enchanted bakery (enchantments cooperate more with their physical substrates than wishes tend to; the bakery part helps) which will produce angel food cake on demand. It too is editable; if she feels like supplying the angels with more variety later it will bake other things. Will that do? Do they need more water than what's in the cakes?
He pauses briefly, then goes on,
Apparently angels can see a bunch of stuff, and it's impossible to make them not, and some of the stuff they can see is - people's essential natures.
Like... who you are as a person, what your life has been like, what kind of stuff you believe in.
It's... in a world, says Kas, unhelpfully. Not ours. One of the ones that doesn't have other life. The alethiometer doesn't know how to pilot it, but it says you can enchant it to stick somewhere and stay stuck.
If there's no other life here I'm gonna call it a fine parking spot. You okay for the enchantment?
It slows, then stops.
Maybe. There could be bad angels hiding somewhere and the alethiometer wouldn't know about them.