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To have a chance at one of the keys or the plan dropping, players need to kill the Keywardens with 5 stacks of [[Nephalem Valor]]. Higher levels of Monster Power increase the odds of a key dropping. Keywardens drop items like other Elite bosses, and can be a good source of legendaries and rares, but their special ability to drop keys is what makes them prized enemies.
All keys, the crafting plan, the [[Demonic Organs]] and the [[Hellfire Ring]] are [[BoA]], which means they can not be traded for or even given away. Players must farm the ingredients themselves, though all players in a multiplayer game can use the portals to the various Uber battles.
* See the [[Infernal Machine]] article for full details.
The Keys and Plan are [[Bind to Account ]] so you they can not trade be traded for them. You can 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]].
