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→Find the Keys and Plan
The first stage in unlocking the Infernal Machine players have to gather 3 keys and a plan from all four acts by killing the Key Wardens. (An even longer and more involved process than Diablo 2′s {{iw|Pandemonium_Event Pandemonium Event}}.)
The Keywardens will appear in their designated areas on all difficulty levels, but can only drop the keys on Inferno, and only to players with 5 stacks of [[Nephalem Valor]]. Playing with the Monster Power system enabled will boost the odds of a key dropping, with a 10% bonus for each level of Monster Power, up to a 100% chance of the drop on Monster Power 10. At MP0 there is a 5% drop rate. <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> Without Monster Power all three's innate chance of dropping a key is equal. <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>(AGAIN THIS WHOLE THING IS WRONG. LVL 10 has less than 30% chance to drop)
[[Magic Find]] does not increase the chances of the keys dropping.<ref>[http://blues.incgamers.com/Posts/10/1/40/819/188318/mf--infernal-machine-keys#postId_504786 Magic Find effects] - Blizzard CM, 17/10/12</ref>
The Keys and Plan are Bind to Account so you can not trade for them. You can 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]].
==Building the Infernal Machine==
