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You can find act 4 keywarden in Gardens of Hope 2nd Tier. He drops Key of Evil if you are in Adventure Mode Torment 1 or above. It is one of the components to craft Infernal Machine, which opens portal to Uber bosses. Uber bosses drop crafting mats for the new Hellfire Ring and, more important, Hellfire Amulet. The blacksmith plan for the new RoS Infernal Machine is a random drop. In Campaign Mode, he drops blacksmith plan for the old vanilla Diablo 3 Infernal Machine (which is pretty useless now). See also: Keywardens: Act 1: https://www.youtube.com/watch?v=Aywy1mWpWAc Act 2: https://www.youtube.com/watch?v=o_k6ghMAIPQ Act 3: https://www.youtube.com/watch?v=mmg3i0r0XxM Act 4: https://www.youtube.com/watch?v=8D4j3HY_KP8 Ubers: uber King Leoric and Maghda (Realm of Discord) https://www.youtube.com/watch?v=uK4bzuaVO-w uber Siege Breaker and Zoltun Kulle (Realm of Turmoil) https://www.youtube.com/watch?v=GgVa9VZuQY8 uber Ghom and Rakanoth (Realm of Chaos) https://www.youtube.com/watch?v=Y4SffiItSX8 uber Diablo (Realm of Fright) https://www.youtube.com/watch?v=RiFAPnQ4C4Q Note: pre-2.2.0 Nekarat was found in Silver Spire Level 1. IMO the mobs there are more dangerous so Blizz move him to this new location to lower the difficulty of farming key for new players?