Fair enough. I would like to pre-emptively suggest that we stay away from real religious texts: all I meant was to note that it wouldn't be unusual for a religious text to contain many books. Any discussion of real religious texts should be avoided.

In any case, I would agree that pre-Ishgardian elezen surely had some religious texts about Halone. Those texts' relationship to the modern Enchiridion is an interesting question, though, especially if any of them contained prophecies that might be retroactively interpreted to mean Thordan, Shiva, Nidhogg, and so on.

My initial preference is to go with my possibility three. The Ishgardian canon will surely have changed over time, as new texts have been added, old texts discovered, new translations made, and so on. I'm sure the church has always regulated its own canon: add a hymn here, revise a history there, clarify a translation there, and so on. That's not automatically a bad thing either. There is no reason why a religious textual corpus shouldn't grow over time, as new works are created, and as new information comes to light concerning old works.

Post-Heavensward, the church will be in a position to continue this process, placing old works into a new context, re-evaluating their significance, and perhaps recognising additions to the the corpus. It's all quite fascinating for anyone interested in religious history or theology. Which I am!

Anyway, the more details anyone can dig up, the better!