[ She takes a key card of her own out of her pocket - it looks fairly similar to everyone else's, but without a number on it. ]
So there's a... special rock, I guess, is the closest I could get to something you're familiar with? Inside of the card, and when you tap it to the reader pad, it can tell that the rock is there and there's a mechanism that pulls open the lock.
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[ She takes a key card of her own out of her pocket - it looks fairly similar to everyone else's, but without a number on it. ]
So there's a... special rock, I guess, is the closest I could get to something you're familiar with? Inside of the card, and when you tap it to the reader pad, it can tell that the rock is there and there's a mechanism that pulls open the lock.