Bloody Armor

This item is used normally when the enemy is incredibly hard to defeat. The way the Bloody Armor works is that you take 0 damage from the enemy while you wear it but you rapidly begin losing HP. Fortunately, it's not fast enough to stop your healer from topping you off rather easily. The gist of this is that if the boss is too hard then you can equip everyone with Bloody Armor and just heal through the life drain.