Bulwark of Kings

The Bulwark of Kings is the upgraded epic level breastplate that is craftable and wearable only by blacksmiths with the Armorsmithing specialty.

Source
This item is crafted with Blacksmithing (375); Taught once by Armorsmith trainers.

The plans could be learned from the Armorsmith trainers:
 * in Ironforge
 * in Orgrimmar
 * in Shattrath City

As an ingredient in Blacksmithing

 * Bulwark of the Ancient Kings