Metal vials. People may wonder why Allomancers use them. Why ingest only small bits of metal, which could run out on you? There are a couple of reasons for this.
First off, you don’t want to eat too much metal because, simply put, it’s poisonous. Kelsier talks a little bit about this in book one, and it’s given token nods from characters throughout the series. I don’t do a whole lot with it—dying from metal poisoning isn’t the type of extended disease you tend to deal with in a novel that only covers a few months time, like this one.
The second reason for metal vials is more simple. Allomancers with the right powers can Push or Pull on sources of metal—the larger the metal source, the harder the Allomancer can Push on it. So, little flakes of metal make a terrible Anchor, and so if you’re caught wearing your vials, you aren’t giving much of an advantage to your enemies.
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