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I've seen from reviews that the new protect and jinx don't affect invulnerable saves. I just got the new codex and I'm reading the rules directly: "improve/worsen the Save characteristic of models in that unit." That's word for word, and it clearly doesn't say armour save, merely Save. How are people sure it means only armour save and cannot also include invulnerable saves? Thanks.

Because it’s the CHARACTERISTIC, not any special rules.

It affects what’s written under the Sv part of the datasheet. And that’s it.