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This article contains information that is no longer relevant to gameplay, but is kept here for informational purposes.
They have an Item Level of 63 and require a character level of 1. They can be stacked up to a maximum of 100.
"The metal used to forge this warped and twisted key bears the mark of Baal’s realm, but its contours suggest it is not complete."
As of patch 2.3, it no longer drops. Existing Keys automatically become Infernal Machines.