Dreadnaught Breastplate

The Dreadnaught Breastplate is the Tier 3 plate chest armor for warriors and gives bonuses to strength, stamina, dodge, and overall defense. It is available through quest items in Naxxramas.

Source
The Dreadnaught Breastplate is a quest reward from the quest which starts with Korfax in Light's Hope Chapel in Eastern Plaguelands. To complete the quest, you must turn the following items to Korfax:
 * 1 Desecrated Breastplate
 * 25 Wartorn Plate Scrap
 * 4 Arcanite Bar
 * 2 Nexus Crystal