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Just Dave wrote:
I don't understand the difficulty in using the re-roll armour saves, you just take wounds and roll armour saves as normal and instead just note/place a marker next to a model if you re-roll an armour save, so if that model cannot do so again that turn. I don't see it would be any more difficult than wound allocation or keeping track of wounds,

You mean how it's exactly the same as either of those except using a new provision that doesn't exist anywhere else in the game?

So your problem with it is that it's original? That because it "doesn't exist anywhere else" it shouldn't exist now?
Re-rolling armour saves in itself isn't anything new. If there was no originality or innovation, that game would go stale.
So the rules with the background of the Custodes and within the rules of the game? I don't see a problem in that case...