Metalgrid is a unique amulet from Diablo II. With charges for a very high level Iron Golem together with Iron Maiden, Metalgrid lives up to its name by cursing enemies to receive quite a bit of damage they inflict back. Defensively, Metalgrid is useful too, bestowing potentially the best increase to Resistances and Defense out of any amulet in the game. It also offers an extremely large flat attack rating boost.