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After the nerf are they worth it anymore it's now a flat 5++ and ony 6" rather than 12" at 70 points less skyshield looks a better bet

The big difference is that you have to be wholly within its radius to get the buff. Previously, you could just allocate wounds to models that were within the radius and take saves from them, even if most of your unit was totally elsewhere.

No, I don't think they're worth it any more unless you have shooty units that are happy being entirely inside that radius and would be targeted by weapons that negate their saves

The main use I've theorized for them is for kataphron destroyers, who desperately need protection as much as they desperately need a reroll aura from an HQ. I kinda doubt that's really worth it, though.

I really don't understand the need for the nerf. As per FAQ they don't seem a viable choice at all now.