As of patch 2.3.0, it always rolls a guaranteed socket. This is one of the few Legendary items in game that cannot be extracted into Kanai's Cube. Since it automatically binds to the player's account upon being made and requires materials only obtainable at level 70, it is unobtainable without access to Reaper of Souls. Passives also do not duplicate if taken normally and on the amulet. If you clear the dungeon, you will gain access to the Tomb of King Kanai, where you will find Kanai's Cube. Each passive skill only works for the class that normally has it: one cannot use this amulet to gain a passive skill of another class. This dungeon appears around the Arreat Crater, in Act 3. The passive skill cannot be re-rolled once an amulet is crafted, so it may be very challenging to get an optimal combination of the skill and stats.

The Hellfire Amulet essentially gives the character five passive skills: it will have a secondary legendary affix that provides a randomized passive skill of the class who crafted it. It rolls stats for level 70, but only requires character level 1 to be equipped. The Hellfire Amulet is a craftable legendary amulet in Diablo III.

Diablo 3 kanai cube ps3