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[[File:Icon_hellfire_ring.jpg|right]]The [[Infernal Machine]] is an end game quest feature introduced in the [[Patch 1.0.5]]. Players must hunt down and fight Key Wardens in order to get keys to create an Infernal Machine which can open a portal leading to a pair of bosses. There are 3 different portals that lead to 3 different pairs of bosses and as the portals are random it will likely have to be done more than 3 times. Meaning hunting down the Key Wardens for the 3 keys each time. The bosses can in turn drop body parts which can be used to craft a high powered [[Infernal Machine#Hellfire Ring|Hellfire Ring]].