That's a relic message from beta that should have been removed.
Aurodium cards were like Chromium but more expensive (supposedly higher chance of drops) but they removed it from game and pretty much rolled everything into the current Chromium cards instead.
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Aurodium cards were like Chromium but more expensive (supposedly higher chance of drops) but they removed it from game and pretty much rolled everything into the current Chromium cards instead.
You're not missing out on much.