Commander Eligor Dawnbringer at Light's Hope Chapel in the Eastern Plaguelands will make a Redemption Headpiece if you bring him the following: 1 Desecrated Headpiece, 15 Wartorn Plate Scraps, 5 Arcanite Bars and 2 Cured Rugged Hides.
You will find the remnants of our fallen heroes on the corpses of the Lords of Naxxramas. Bring those desecrated keepsakes to me along with wartorn plate scraps and crafting materials capable of revitalizing the cursed armor and I shall craft a fine piece of armor for you.
Keep it covered, <class>.
The entirety of this quest happens at Eastern Plaguelands