Reliquar stuff to appeal.
Preservation Enchantment
A enchantment based upon our work on physical protection, this is slightly different. It doesn't just have to protect from the physical, but from it's own aging. Thankfully we have one solution in our coral, so it's a matter of getting said enchantment right while not outright draining from movement?
A tough problem to be sure. We'll start with preserving books with a coral casing. The physical ward is altered to sink deep into the structure of the book within, then we tune it out of alignment, slightly to the side rather than the up and down of the original. This prevents the spell from draining during movement of the casing. We then charge the enchantment to find out how it works, and submerge it for a couple of days. In this manner we test to see if these books become waterlogged, and the power consumption. Ideally the enchantment will stabilize anything within that isn't living.
This type of magical research is boring. So Muu supposes they will tap on the Revisionists to help with this. Not only does it let them better preserve their many texts, they're also a lot more methodical about refining this. And once a the proof of concept is made, it can be scaled up into a Rare fixture of any library, meant to protect a whole display case instead of a single book, perfectly caved from coral melded with wood.
Megalyterotheikos Tomeas Ritual
This ritual is designed to broadcast the Ymis ward, empowering it off of magical energy. For us it makes use of liquid light barrels buried in the earth, which is slowly leached over the course of the day. Star Witches' gather to build the ward and then attach it to this source, before anchoring it to a solid surface. Unlike the Ymis ward, this one makes damaging anything it's layered to far far more difficult. Compared to the original, there's no contest. So long as it's connected to the earth, it isn't going to fall any time soon. This naturally has uses in cases where we can prepare the battlefield ahead of time, but it's primary advantage is in fact for our allies the Reliquars. They would appreciate a good ward scheme, and this is definitely one of the better ones. They're need to provide their own way to empower it though, but perhaps they may help us in turn to not rely on the barrels entirely. While it's technically possible for acolytes to cast this spell, it's far more fiddly since the spell also has to infuse the material, making it solidly Uncommon. On the other hand, the Reliquars likely have the experience to apply it, or could help get our Witches in. Others may also appreciate the improvement of security. Note that only one type can really be applied as it infuses the material.
One is boring refinement and experiment work for something that will only be appreciated by librarians and historians. (Revisionists helping.) The other is Turtle. Pure Turtle. The walls won't fall that easily next time, and any case we're on the defense is a major boon. Notably, neither is really Amber level since it's an improvement of an original, though the latter could be useful if going full turtle. (Like casting it on a moving castle on a giant turtle.)