Fortitude of the Scourge

Fortitude of the Scourge is a special enchant that is applied to shoulder armor to increase stamina and armor rating.

Source
This item drops off Sapphiron in Naxxramas.

Selling this item
This can be applied to lower level Bind on Equip or white (common) shoulders. Lower level character's, also known as "Twinks" pays thousands of gold for this and the other Scourge shoulder enchants.

Shattrath Faction Equivelants

 * (+15 dodge rating, +10 defense rating)
 * (+10 dodge rating, +15 defense rating)