Hero armor crafters take the rewards received from a Nightfall challenge mission and use these materials to upgrade the armor of one of your heroes. They are recognized by the "[Hero Armor]" suffix in their names. Runes and insignias are preserved when upgrading hero armor.
Bahldasareh accepts Stolen Sunspear Armor and produces Elite Sunspear armor for Koss, Dunkoro, Melonni, Acolyte Sousuke, or Acolyte Jin.
Johe accepts Ancient Armor Remnants and produces Ancient armor for Tahlkora, Zhed Shadowhoof, Margrid the Sly, Razah, or Master of Whispers.
Mureh accepts Mysterious Armor Pieces and produces Mysterious armor for Zenmai, Olias, Norgu, Goren, or General Morgahn.
Armorsmith of Whispers accepts Primeval Armor Remnants and produces Primeval armor for all heroes in Guild Wars Nightfall.
Gunnar Poundfist accepts Deldrimor Armor Remnants and produces Deldrimor armor for all heroes in Guild Wars Eye of the North.
Master Armorer Kor accepts Cloths of the Brotherhood and produces Brotherhood armor for all heroes in Guild Wars Eye of the North.