Dreadnaught Helmet

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

Source
The Dreadnaught Helmet 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 Helmet
 * 15 Wartorn Plate Scraps
 * 5 Arcanite Bars
 * 1 Nexus Crystal