Judging by Sayaka's example, it seems like once a meguca learns to make an enchantment, they can repeat it in very little time. So if we can teach someone the enchantment, then they can probably make quite a few of them per day. Not quite factory mass-production, more like a collection of medieval blacksmiths handcrafting horseshoes.
It's for this reason that I'd say that the following two enchantments are the most important projects on the list:
Enchantment
Grief Control - We should start small, with an enchantment that attracts or repels grief. If the proof of concept works, then we can keep refining and scaling it up, until we have artificial grief seeds. Based on the potential feedback loop, this should be attempted without the enchantment enhancement construct.
Grief Stability - Try to make an enchantment that holds grief in position instead of letting it disperse. May require "marking" it as belonging to Sabrina so it stays solid outside where we naturally impose that effect if some theories are correct. May or may not be linked to range extension.
Right now we're the lynchpin of everything we plan to do, but as soon as we can start showing other magical girls how to repeat for themselves what we can do naturally, the odds of leaving a lasting change on the world greatly increase.
And it continues beyond that, to every major thing we wish to do: Once we have a way to revert Grief seeds to soul gems and revive magical girls from that state, the next step should be finding a way to copy that artificially. (Likewise finding a way to artificially clear grief seeds, seeing as I expect that will be necessary.)
There are two reasons for that. First is simply the "shit happens" principle. A lot of things could go wrong, from disasters to simple lack of time, and anything that doesn't depend on us completely is less affected by anything that affects us.
Secondly is the Factorio Principle: The more magical girls who can do what we do via enchantment, even if they're only a fraction as effective as us, the more that can be done in total. And it only becomes truer once they start training their own students.
You know what
@Redshirt Army, I was wrong. Knowing we were Walpurgisnacht
does have one implication at current time.
Kyubey would
surely be able to use that information against us if he found out about it.
Well, on this line thinking:
A simple test has occurred to me that might help to prove or disprove the idea: If we're born of a being that is a conglomeration of witches, then we would also be a conglomeration of magical girls, and so it would also it would make sense that we had all the knowledge of a bunch of magical girls, simply locked away. This ties into our bookmaking abilities: to teach ourselves concrete mixing makes sense if one of those girls once knew it herself. In this framework, we're not writing the book from scratch, just recovering it.
And I'll bet you, if we can write the book on concrete for that reason,
diaries might not be beyond us either. If Sabrina was once Walpurgisnacht, It may well be possible to create
multiple diaries sourced from various originating magical girls.