Duriel's Shell is a unique Cuirass. With a high boost to Life, Defense, and all Resistances (especially to Cold Resist) makes Duriel's Shell a great defensive armor. It is a good candidate to be upgraded to further improve its defense due to its large percentage bonus to defense and the fact that Great Hauberks only require moderately high strength. When Ethereal, it is a very popular option for equipping Mercenaries, as it sports the Cannot be Frozen attribute.