Dreadnaught Waistguard

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

Source
The Dreadnaught Waistguard 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 Waistguard
 * 8 Wartorn Plate Scrap
 * 1 Arcanite Bar
 * 5 Cured Rugged Hide