Shrine of the Doomed Celestial
The Sage began: "Gods we know how to deal with. Powerful, yes, but predictable. Follow the assigned rituals, observe the observances, and you won't go far wrong. Demons are worse. But with demons, it's not hard to figure out what they want. And though they cheat, they're quite straight up about their methods if you bother to ask. But angels... angels are another thing altogether..."
The scriveners have a perfectly articulated theology regarding the doomed celestial; why it's doomed, who doomed it, and so on. But frankly, nobody but them understands it. What's clear is that the doomed angel lives in a shrine, and nobody goes there unless they really need to. The angel is ostensibly on our side, it's true, but it has a penchant for meting out unpredictable and dangerous announcements, prophecies, punishments, and visions.
But today we need something from the shrine, really need it. How you get it is up to you. Just don't come back without it.