#1 - Jan. 22, 2015, 11 p.m.
There are many good guides on the specifics of the ROS hellfire ring and how to obtain it, I will only list the drop locations specific to the 360 (1 recipe, 4 keys and 3 materials)
Infernal Plans = Keywardenin Act IV - Silver Spire Level 1
Key of Bones = Keywarden in Act I - Fields of Misery.
Key of Gluttony = Keywarden in Act II - Dahlgur Oasis.
Key of War = Keywarden in Act III - Stonefort.
Key of Evil = Infernal Machine of War > Realm of Turmoil
Leoric's Regret = Infernal Machine of Bones > Realm of Discord
Vial of Putridness = Infernal Machine of Gluttony > Realm of Chaos
Heart of Evil = Infernal Machine of Evil > Realm of Fright
