While wandering through some underground passage, you find a dead adventurer. You think that today is your lucky day because although his armor is rusty, perhaps there’s something good in his pockets!
As you reach down to claim your prize, the rust begins to climb its way up your arm and you realize far too late that it was never rust at all.
Never forget that the life of an adventurer is often a short one and there are far worse deaths than a goblin arrow.
–Argo
Argo RPG 
What would you have happen if the players lured a rust monster to the infected armor?
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Anything that makes the DM think too much immediately tears open a portal to the astral realm.
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