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* The Blacksmithing Plan and random keys may drop from [[Nekarat the Keywarden]] in Act IV - Silver Spire Level 1
The first three keywardens can only drop their one key. For instance, Odeg will only drop the Key of Destruction; never a Key of Hate or Terror. Prior to v1.07 08 Nekarat could only drop the Plan and was thus useless to any player who already hd had it, but in that patch he was given the ability to drop any of the three other keys as well.
The only way to increase the chances of a key dropping is by playing on a higher [[Monster Power]].<ref>[http://blues.incgamers.com/Posts/10/1/40/819/188318/mf--infernal-machine-keys#postId_504786 Drop rate at MP0] - Blizzard CM, 17/10/12</ref> <ref>[http://blues.incgamers.com/Posts/10/1/40/819/188833/act-3-key-warden-drop-rate-unbalanced Innate drop rates equal] - Blizzard CM, 22/10/12</ref>
The Keys and Plan are [[Bind to on Account]] so they can not be traded for. A character may have more than 1 of each key at a time, but each key is consumed by the crafting process, so you will need multiple copies of each key to build the multiple Infernal Machines required to explore each portal area and gather all the materials required to craft the [[Hellfire Ring]].