There are two main components in the crafting process of the Inferno Machine:
3 keys: The key of Destruction, The key of Hate, and The key of Terror
1 plan for the Inferno Machine
There is one component per act in the game. In acts 1-3 the keys drop and in act 4 the plans for the machine drop.
With regards to droprate, it depends on the monster power setting. Each setting gives you a 10% drop rate for a component on a keywarden. So if you kill a keywarden on monsterpower level 5, you have a 50% chance of a machine component. If you have the MP on power level 10, then the drop is guaranteed.
Nephalem Valor has something to say as well. A full 5 stack of NV is needed to even get the keys to drop. So if you are going to farm the keys, then get a full 5 stack before you hit a keywarden.
Act 1 keywarden – Odeg the Keywarden
This handsome gentleman spawns in Fields of Misery at a random spot in the fields.
Odeg spawns a random place in the Fields of Misery and is the first step to crafting your very own Infernal Machine!
He drops the Key of Destruction:
Key of Destruction from Odeg the Keywarden.
Act 2 Keywarden – Sokahr the Keywarden
Sokahr spawns randomly in Dahlgur Oasis:
Sokahr the Keywarden is a dervish type mob and spawns randomly around the map.
He drops the Key of Hate:
Sokahr drops the key of Hate, the second key for the Infernal Machine
Act 3 keywarden – Xah’Rith the Keywarden
Xah’Rith drops the final component for the Infernal Machine. He can be found on the Battlements at the beginning of Act 3. It seems that patch 1.0.5 also introduces a few more elite spawns to this area, since they are now 4-6 elite packs, compared to the previous 2-4 packs. A nice little addition, which really makes this one of the new good farming places for act 3.
Xah’Rith spawns on the battlements. Again at a random spot, but with the added elite packs in patch 1.0.5 to this area, this is also a really place to farm.
Xah’Rith drops the final key; the Key of Terror.
Xah’Rith drops the final key to the Infernal Machine; the Key of Terror.
Act 4 Keywarden – Nekarat the Keywarden
Nekarat spawns in Silver Spire level 1:
Nekarat the Keywarden is your final stop in order to complete your very own Infernal Machine
As mentioned earlier, he drops the plans for the Infernal Machine:
With the plans for the InfernalMachine in hand, you are now ready for the next step.
Crafting the Infernal Machine
In order to craft the Machine, you need the three keys, the plans, a level 10 Blacksmith, and 12,000 gold. This shouldn’t be a problem for most. This will leave you with an Infernal Machine in your pocket.
Crafting the Machine is cheap, but it could take time if you don’t have the gear for farming the keywardens at the higher monster power levels.
Using the Infernal Machine
Using the Machine requires you to start in act 1 on the quest called “Return to New Tristram”. In town near the TP, there is a house called the “Heretic’s Abode”. Enter here and you can activate the Infernal Machine and you will call forth a portal to one of three realms: Chaos, Discord, Turmoil. Please note that each Infernal Machine is a one-time use only!
In each realm you will find 2 uber bosses at once. Opening a portal opens it to a random realm, so the only way to guarantee you aren’t going to the same realm with each Infernal Machine, is to open 3 portals at once, which will then go to three different realms.
Depending on the monster power setting, your MF and your Nephalem Valor, these bosses also drop parts to complete a Hellfire ring, a new craftable in patch 1.0.5. I will delve further in to how to get your own Hellfire ring in an article later this week. These uber bosses drop components for the Hellfire Ring.