Keywardens for Infernal Machine - Finding the Keys
Players will be able to encounter the Keywardens in any difficulty, but only in Inferno each level will increase the drop rate of both the keys and the plans by 10%, all the way up to a guaranteed 100% drop chance at Monster Power 10.will they have a chance to drop pieces of the Infernal Machine. While Monster Power is not required,
How to to turn on Monster Power: Go into Options > Gameplay and look for "Enable Monster Power Selection". There is currently a bug where the MP option turns off randomly, and you will have to go into the options and turn it on again. After enabling it, you can select a monster power level in the quest selection menu.