Fiery Chain Shoulders

Fiery Chain Shoulders are Blacksmith-made mail shoulders with bonuses to stamina, intellect, and fire resistance.

Source
Fiery Chain Shoulders are crafted by Blacksmiths with a skill level of 300 who also have the Armorsmith specialty.

The components are:
 * 16 Dark Iron Bars
 * 4 Fiery Core
 * 5 Lava Core

The plans are sold by Lokhtos Darkbargainer in Blackrock Depths. You must have Revered reputation with the Thorium Brotherhood to purchase the plans.