(out-of-world. One rule, stated where it becomes load-bearing.)
The archive keeps four records apart from the rest, in a room you have to ask for twice. This is that room. What follows isn’t filed with the working lore because it’s not working lore; it’s the deep record, and the archivist hands it over only to readers who have come all this way on purpose. You have. So.
You have read most of a book to get here, and this is the page that tells you the last part of it won’t resolve.
The Rift never receives one answer. Three truths about it circulate in-world; no source ever confirms one; any future document that resolves the mystery is non-canon by definition, including any document produced by us. Anything that offers you a settled answer has been compromised, and the compromise is usually the point.
This isn’t a gap in the record. That’s how the record is built. Everything else in these volumes can be revised. This can’t.