Simply make your way to the healer in New Tristram and attack the door behind him. The entrance can only be found on the last quest of Act I, 'Return to New Tristram'. After that it's time to enter the Realm of Chaos. Once you have all the materials you need to visit the blacksmith to create your Infernal Machine.

Note: He has a small chance to drop any of the other keys from a Keywarden. Nekarat also has the ability to create a large firey spell on the ground that deals damage to anyone inside of it. Jailer, Knockback and Nightmarish are his main affixes along with a curse that reduces healing effects by 75%.

He is found anywhere in the Silver Spire Level 1 of Act IV. The last Keywarden drops the Infernal Machine Plan. He has the ability to teleport and periodically rain down corpses that explode causing a fair amount of damage while also creating a small area of ice that slows you substantially. The third Keywarden is found anywhere in the Stonefort of Act III. His non-special attack is a spin attack that does damage to all those near him. Sokahr is a very anti-ranged monster as he has Missile Dampening, Mortar and Electrified as base abilities. The second Keywarden is found anywhere in the Dahlgur Oasis of Act II. Just remember that when Odeg dies he will leave behind a exploding ball of fire that can kill you! His regular attack is a ranged spear throw. Odeg has the Molten and Jailer affixes and a fire attack that shoots three balls of fire. The first Keywarden is found anywhere in the Fields of Misery of Act I.

A new machine must be built each time you want to fight another pair of bosses.

You can have more than 1 key at a time.

The Keywardens are a guaranteed spawn in each game but may spawn anywhere on the specific maps.

The plan is a guaranteed drop off any of the keywardens Below is the drop rate per Torment level.

Keys and organs can only drop on Torment 1 or higher. Video Guide to location of the Keywardens.Crafting the Hellfire Ring & Ring Stats.Uber Skeleton King & Maghda - The Realm of Discord.Uber Siegebreaker & Zoltun Kulle - The Realm of Turmoil.Uber Ghom & Rakanoth - The Realm of Chaos.Key of Evil - Silver Spire Level 1, Act IV.Key of Gluttony - Dahlgur Oasis, Act II.Click any topic to jump to that part of the guide. It is also a required step in crafting the Hellfire Ring. The Infernal Machine is a device that once crafted opens a portal to another realm where you can face off against Uber versions of Diablo 3 bosses.

Diablo 3 infernal machine locations