Here's a video on how to find all the (Basic) Keywardens and collect the Infernal Machines they drop.
Act I - Odeg - Fields of Misery
Act II - Sohkar - Dalhgur Oasis
Act III - Xah'Rith - Stonefort
Act IV - Nekarat - Gardens of Hope 2nd Tier (Not in this video. Just figured out where they moved him)
These machines are used to access the 3 Realms where you must fight two of Diablo 3's hardest bosses, to collect Demon Body Parts.
Realm of Chaos
Realm of Turmoil
Realm of Destruction
With a set of 3 Demonic body parts, you can head over to Squirt in Act 2 and purchase plans to create your very own Hellfire Ring!
Writhing Spine
Vengeful Eye
Demon Fang
Let me know if you still play D3, so we can play together.
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