Okay, here's the first crack at a school!
I have to admit, I was hoping I could create these things mostly by stapling together existing spells into a five-rank progression. I may be able to do that in some places (this one comes pretty close), but overall, I don't think I'll be able to; there are too many places where I'll have to hybridize things or tweak the power level up or down or just come up with something that isn't really A, B, or C, but aims for the same general target. But when a particular technique is akin to an existing spell, I'll put the name in parentheses with a tilde.
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KUNI SHUGENJA
Rank One -- The Kuni learn to call upon the unsullied power of jade, channeling it into a burst of pure, sacred energy that burns Tainted targets. (~Jade Strike)
Rank Two -- The power of jade can protect an area from Tainted incursions, harming those who enter or even holding them back entirely. (~Ward of Purity)
Rank Three -- When the Crab venture into the Shadowlands, the training of the Kuni guards them against corruption. (~Strength of the Crow)
Rank Four -- Some among the Kuni are capable of burning the Taint out where it has already taken hold. (~Purge the Taint, likely scaled up to give a benefit when cast on living creatures: possibly a re-roll vs. Taint if cast soon enough, or maybe removing it at the cost of a rank of Earth if cast within a slightly longer span of time. "Longer" would mean "a few hours" at best, not days/weeks/months/years.)
Rank Five -- Masters of the Kuni can stop Shadowlands creatures in their tracks, imprisoning them for later disposal. (~Tomb of Jade, Major Binding, or Prison of Earth; something like that. Possibly I will move this down to R4 and move ~Purge the Taint up to R5.)
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As you can see, this is still mechanics-free. In this particular instance I may wind up using most of the numbers from the actual spells, but I don't know for sure yet -- I feel like I need to get most or all of the technique effects in place before I'll know how I want to approach the mechanics. Right now I'm leaning toward saying that techs are rolled with different skills and Traits, while the spells available to everybody are rolled with School Rank / Ring in the usual way, but who knows.
Kitsu may be next.