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Infernal Machine


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The Infernal Machine is an end game quest feature introduced in the v1.0.5 patch. This multi-stage event allows players to find keys, which can be used to open red portals to special boss fights. Those bosses can drop special monster organs, which can be crafted into the legendary Hellfire Ring.

This event is only functional on Inferno difficulty and is only viable for very strong characters. It's meant to provide a fun bonus late game feature for expert players, adding additional challenge and farming options.


[edit] Quick Summary

Here's a quick summary of the steps in this event. See the sections below for full details about everything related to the Infernal Machine.

  1. Obtain a key from each Keywarden and the Infernal Machine plan.
  2. Use the keys to open a red portal to one of the three Realms.
  3. Slay the special uber bosses in the Realm to earn one of the three demon organs.
  4. Craft all three organs into a Hellfire Ring.

Note that steps 1-3 must be repeated multiple times, since you must create at least three red portals to obtain all three demonic organs. Furthermore, unless you are playing on Monster Power 10, the keywardens do not always drop keys and the uber bosses do not always drop the demonic organs.

[edit] Find the Keys and Plan

The first stage in unlocking the Infernal Machine players have to gather 3 keys and a plan from all four acts by killing the Key Wardens. (An even longer and more involved process than Diablo 2′s Pandemonium Event.)

The Keywardens appear in their designated areas only on Inferno difficulty. (They were found on all difficulties prior to v1.08.) If a player has 5 stacks of Nephalem Valor the keywardens may drop a key. The only way to increase the odds of a key dropping is to increase the level of Monster Power. [1] [2]

Key drop odds per Monster Power level:

  • Monster Power 0: 5%
  • Monster Power 1: 10%
  • Monster Power 2: 20%
  • Monster Power 3: 30%
  • Monster Power 4: 40%
  • Monster Power 5: 50%
  • Monster Power 6: 60%
  • Monster Power 7: 70%
  • Monster Power 8: 80%
  • Monster Power 9: 90%
  • Monster Power 10: 100%

Magic Find does not increase the chances of the keys dropping.[3] though it does affect the other items the Keywardens drop, and they can be an excellent source of Rares or Legendaries.

The four keywardens and the planwarden are:

Key of Destruction Key of Hate
Odeg.jpg Sokahr the keywarden.jpg
Odeg in the Fields of Misery, Act 1 Sokahr in the Dahlgur Oasis, Act 2

Key of Terror Infernal Machine Plan
Xahrith.jpg Nekarat.jpg
Xah'Rith on the Stonefort, Act 3 Nekaret in Silver Spire, level 1, Act 4

The Keys and Plan are Bind to Account so you can not trade for them. You can have more than 1 of each key at a time, but each key is consumed by the crafting process, so you will need multiple copies of each key to build the multiple Infernal Machines required to explore each portal area and gather all the materials required to craft the Hellfire Ring.

[edit] Building the Infernal Machine

Icon portal device.png
Doorway to Hell
Once you have the three keys and the infernal machine plan visit the Blacksmith. He needs to be level 10 to craft the machine recipe, and this costs 12,000 gold per craft. This creates a Portal Device which appears in your character's inventory and can be carried around until you decide to use it.

To use the device join a game at the Act 1 quest Return to New Tristram (db) and locate Brother Malachi the Healer in the north east of Tristram. The house behind him has a boarded up door which is normally unclickable. With the Portal Device his door will light up as clickable and lead into the Heretic's Abode.

Once you're inside the house, right click the Portal Device in your inventory. This spawns a red portal that will take you to one of the three special Realms where you must battle two Uber bosses at once. Upon death, one of them *may* drop the special monster organ which is required to craft the Hellfire Ring.

As with the keywardens, you *must* have the maximum 5 stacks of Nephalem Valor active when you kill the bosses to have any chance of earning their monster organ. Also, killing them on a higher setting of Monster Power will increase the odds of getting the organ by 10% per Monster Level, with a 100% chance on the maximum Monster Level 10.

Each realm contains two bosses you must fight at the same time. These bosses are all familiar monsters from elsewhere in the game, but in this battle they are greatly buffed in power and boast some new abilities. Blizzard estimates that they are approximately as difficult as Diablo himself, on Inferno difficulty.

The machine will only work once and open one portal. To open another portal you need to reconstruct the machine again, by collecting the three keys, visiting the Blacksmith and paying him 12,000 gold to craft you another Infernal Machine device.

[edit] Rewards

The special uber bosses drop loot like normal elites, and also have a chance to drop the monster organs that are required to craft the Hellfire Ring.

As with the keys from the Wardens you need to have 5 stacks of Nephalem Valor and each level of Monster Power will give you a 10% chance to drop the item, so MP10 gives you a 100% chance to drop.

[edit] The Hellfire Ring

Blacksmith plan to create the Portal Device.

Squirt the Peddler sells the Designs that teach the Jeweler to craft Hellfire Rings. There are 4 such Designs, one for each type of attribute and each sells for two million gold. Purchase a plan and right click on it while interacting with the Jeweler to teach him that recipe.

To craft the ring a character must have 50,000 gold and one of each of the Demon Organs in their inventory.

He can craft one of four varieties of the ring where one of the affixes is guaranteed to spawn with +170-200 to a single attribute, either Strength, Dexterity, Intelligence or Vitality. The full ring stats are as follows:

  • +170-200 to one Attribute.
  • Increase Bonus experience by 35%
  • Chance to launch an explosive ball of Hellfire when you attack.
  • 4 random properties

The ring is account bound and therefore can not be sold or traded however it can be Salvaged. [4]

  • You can only wear one Hellfire Ring. Your Followers can wear one also.
  • There is no level requirement on the ring so any of your characters can wear it.

The main perk of the ring is the substantial increase to Experience gain, and the goal for most players is to create a ring that's got decent stats as well, so they're not giving up too much DPS by using the Hellfire Ring instead of a Legendary or Rare ring. Followers can equip the Hellfire Ring as well, but just as with Magic Find and Gold Find on followers, they only share 20% of the bonus experience to the player. Thus a Hellfire Ring on a Follower is worth 7% more Experience to the player.

[edit] Gallery

[edit] Infernal Machine Videos

These two videos show how to find the various Keywardens.

The Realm of Discord. Battle uber versions of King Leoric and Maghda for a chance to obtain the Writhing Spine.

The Realm of Chaos. Battle uber versions of Ghom and Rakanoth for a chance to obtain the Devil's Fang.

The Realm of Turmoil. Battle uber versions of Siege Breaker and Zoltun Kulle for a chance to obtain the Vengeful Eye.

[edit] The Infernal Machine Teased

The first word of the Infernal Machine came in a Patch 1.0.5 Sneak Peek developer blog post on September 13, 2012 [5]. The brief quote is below:

New Event: Infernal Machine
The Infernal Machine is a device that will allow level-60 players to battle “uber” versions of some of Sanctuary’s most nefarious bosses. While the rewards for defeating these bosses will be great, some assembly is required.

More early details were teased in developer interviews with Jay Wilson and Wyatt Cheng, The feature was teased pre-patch in several developer blogs [6] and interviews[7] [8], in late September 2012.

[edit] References

  1. Drop rate at MP0 - Blizzard CM, 17/10/12
  2. Innate drop rates equal - Blizzard CM, 22/10/12
  3. Magic Find effects - Blizzard CM, 17/10/12
  4. Salvaging the ring - Blizzard CM, 05/10/12
  5. Blog Update - Blizzard, 13/09/12
  6. Patch 1.0.5 Sneak Peak - Blizzard CM, 13/09/12
  7. Interview - IGN, 17/09/12
  8. Interview -, 18/09/12