Monsters that comes to be when mamono mana gather within lifeless armor. They are half transparent but only to their husband. In the eyes of others, they appear as an empty suit of armor. After becoming a mamono, the durability of the armor increases by a immense margin. They will risk their lives to protect their owner and can be worn like regular armor. They even become custom tailored for their wearer, granting them not only defense, but a feeling of security. Their Hearts are solid as steel.