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You can get 75 of them for a fiver, and the whole treasure-trove of 150 by shelling out a tenner. And you won't even have to go exploring dead gods beached on nightmare shores for them, which is more than your characters can say. They're designed as interesting puzzle-pieces, unusual tools that make the world feel like a weirder place, encourage creative problem-solving from your players, and offer cool roleplaying opportunities to boot.