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I know this seems like a silly question, but I'm curious as far as AOS lore is concerned. Does Warpstone have any adverse reactions or affects to the Sigmarite armor of Stormcast Eternals? Like, other than being shot at the stuff which we saw in a trailer can kill them. But how potent is warpstone overall to Stormcast as opposed to just normal humans? Does their supernatural forms offer them any protection or their armor?

It can affect them over time, but it's not an instant effect. Varanite (which is much more potent) can have an instant effect and can be seen in the Broken Realms supplements.