Keywardens are available in both Story and Adventure Mode. Also, they only drop keys when you are at level 60 (for the old Infernal Machine) and at level 70 (for the current Infernal Machine) at Torment difficulties only. T6 has a 50% chance for the key to drop, and each Keywarden has a chance to drop a key of a different act in addition to its own when slain.

This post has been edited by Kevmeister: Sep 22 2014, 02:49 PM