The Iron Wolves Doctrine is a legendary crafting material used by Blacksmith Haedrig Eamon to craft the Asheara's Vestments set. It drops off Ssthrass (The Sliverbolt).
Ssthrass can be found in Act II: Dahlgur Oasis at the bridge leading to the entrance of the Ancient Waterway
Demon Hunters should double-camp Ssthrass because I got this recipe from him too: Sydyru Crust (Legendary 2-Hand Bow).
Asheara's Finders - Boots
[table id=82 /][/bluepost]
Asheara's Ward - Gloves
[table id=81 /][/bluepost]
Asheara's Pace - Pants
[table id=79 /][/bluepost]
Asheara's Custodian - Shoulders
[table id=80 /][/bluepost]