In order to obtain a Hellfire Ring or Amulet, one has to work their way through the Uber Boss system of harvesting machines and organs to produce a legendary ring or amulet (official blog post).

To create the infernal machine required to open the portals to the Ubers, the keys are drops from mobs nick named Key Wardens.

Where are the various key wardens? Are there any requirements for making the machines drop? What's the drop rate on different difficulty settings?

  • 2
    @JQAn As long as you choose a quest that has a waypoint for the warden's location, it doesn't matter which one you choose. If all you care about is farming keys, just always choose the last quest, to give yourself the maximum flexibility for earning NV.
    – bwarner
    Commented Oct 19, 2012 at 15:14
  • @Tharius do you mind changing your accepted answer to the correct one
    – l I
    Commented Feb 27, 2014 at 16:16
  • @Z Do you mind changing your accepted answer to the correct one via the edit button?
    – Tharius
    Commented Mar 2, 2014 at 20:18

5 Answers 5


This post has been updated for 2.0.1 to only contain the locations of the keywardens.

The updated drop rates can be found in this answer:

Key of Destruction

  • Odeg the Keywarden is in Fields of Misery in act 1. Odeg always spawns with the molten effect, and he has a big fireball spell that can do ok damage. He also has the jail affix and likes to kite a lot, making it difficult to engage him as a melee character.

Key of Hate

  • Sokahr the Keywarden spawns in Dahlgur Oasis. Dahlgur oasis is quite big and he can spawn anywhere in that zone, so having multiple people helps a lot. Sokahr has an electric attack and a whirlwind attack. When he starts whirlwinding, I recommend to back up since that attack hurts a lot. He also has mortars.

  • Another note here is that he is a cake walk for a demon hunter using the ball lightning attack. Since he often (always?) appears with a slow missile shield these balls hang around sparking on him if you can stay far enough away that he isn't chasing you. Alternately make him chase you in a circle so the balls stay within his shield.

Key of Terror

  • Xah'Rith the Keywarden is in Stonefort. Xah'Rith is the hardest of the 3 key wardens as he teleports around a lot and have a high damage aoe attack. If you are a melee character, it helps a lot if you lure him to one of the many stair cases in the area so he can't run away as easily.

Infernal Machine Blacksmithing Plans

  • Dropped from Nekarat the Keywarden in Act 4. Has very high damage and aoe. He also has a chance to drop any of the 3 keys.
  • 1
    You left out Sokahr's brutal mortar attack. I think he is Vortex as well. Quite a pain for ranged characters.
    – bwarner
    Commented Oct 19, 2012 at 20:48
  • 2
    @bwarner well I'm a barb so I tend to ignore that stuff :D
    – l I
    Commented Oct 19, 2012 at 22:16
  • I start the act two one on the assault on Belial because it gives you Leah and Adria, which not much but does help.
    – Mike
    Commented Nov 14, 2012 at 14:32
  • 1
    Another helpful hint is to get 3 sets of all 3 keys. That will guarantee that you'll unlock all 3 realms. Otherwise, you make get the same organ twice...
    – Coomie
    Commented Apr 10, 2013 at 5:35
  • In order to craft the level 70 Infernal Machine, you also need a Key of Evil, which drops from Nekarat.
    – Adeese
    Commented Sep 27, 2014 at 21:32

The Reaper of Souls update has substantially modified this process from the launch version.

There are 4 different machines that can be created which correspond to the particular fights to obtain a particular organ. No more opening 3 portals to guarantee seeing the uber you need.

The machines spawn directly from the Keywardens. As of patch 2.3 each member of a party has an independent probability of generating a machine.

The Infernal Machine plan can drop from any of the Keywardens and they all have a small chance to spawn a second key that is not particular to them.

The level 70 Hellfire Ring requires one of all four organs, the new crafting plan which costs 5,000,000 gold coins from Squirt in Act 2 and 50,000 coins to craft.

The organs are:

It is still possible to obtain the original keys while you are level 60 and to craft the level 60 Hellfire Ring as per the legacy information that used to be contained in answers here (you can see that info from reviewing edits on the top answers).

It is not possible to stack the level 60 and 70 Hellfire Rings to obtain an 80% experience gain bonus.

The key rates are reported to be but are not universally accepted as:

  • Torment I: 25%
  • Torment II: 28%
  • Torment III: 33%
  • Torment IV: 38%
  • Torment V: 43%
  • Torment VI: 50%
  • Torment VII: 60%
  • Torment VIII: 70%
  • Torment IX: 80%
  • Torment X: 90%

The organ drop rates are estimated to be:

  • Torment I: 100% * 1 organ roll
  • Torment II: 10% * 2 organ rolls
  • Torment III: 20% * 2 organ rolls
  • Torment IV: 30% * 2 organ rolls
  • Torment V: 40% * 2 organ rolls
  • Torment VI: 50% * 2 organ rolls
  • Torment VII: 100% * 2 organ rolls
  • Torment VIII: 10% * 3 organ rolls
  • Torment IX: 25% * 3 organ rolls
  • Torment X: 50% * 3 organ rolls
  • 1
    Version 2.3 has removed Keys completely. Now Infernal machines drop directly from keywardens.
    – Orc JMR
    Commented Oct 13, 2015 at 5:38

Lylirra made a blue post about drop chances. You have to have 5 stacks of Nephalim Valor and the drop chance scales up to 100% with monster power level.

You'll need five stacks of NV in order for the keys and the demonic organ pieces to drop.

Currently, both the keys and the demonic organ pieces (Vengeful Eye, Devil's Fang, and Writhing Spine) have higher chances to drop in higher MP levels, all the way up to 100% in MP10.

When they appear, they'll show us as legendary items, making them easy to distinguish from the other items the mobs may pop.

Diablofans posted information on the location of all of the keys:

  • Key 1 - Found on Goat Mutant Key Warden in the Fields of Misery (Act 1)
  • Key 2 - Found on Dune Dervish Key Warden in Dahlgur Oasis (Act 2)
  • Key 3 - Found on Morlu Spellcaster Key Warden in Stonefort (Act 3)
  • Infernal Machine Plan - Found on Terror Demon Key Warden in Silver Spire Lvl 1 (Act 4)
  • The Key Wardens will always spawn in each Inferno game.
  • What is the optimal quest to start in each act for getting NV 5 just before finding the Wardens?
    – juan
    Commented Oct 19, 2012 at 15:00
  • 2
    I typically start at the last quest in the Act, go to my preferred farming spot to get 5 stacks, then go to the area where the Key Warden is. If you are only concerned with keys, do the same thing but go straight to the correct area. Just go somewhere else for a bit if you don't have enough NV by the time you find the Warden.
    – dpatchery
    Commented Oct 19, 2012 at 15:09

As verified by a Blizzard employee, this is the up-to-date information about keys, in Patch 2.0.1:

1) You don't need to do anything special; just kill the Key Wardens

2) Keys only drop on Torment difficulty

3) Key drop rates:

  • Torment I: 25%
  • Torment II: 28%
  • Torment III: 33%
  • Torment IV: 38%
  • Torment V: 43%
  • Torment VI: 50%

Since 2.0.1 and the remove of NV buff. Keys and others stuffs can drop at anytime.


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