Dreadnaught Legplates

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

Source
The Dreadnaught Legplates are 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
 * 20
 * 4
 * 3