public static ItemAttribute operator -(ItemAttribute item1, ItemAttribute item2)
        {
            ItemAttribute itemAttribute = new ItemAttribute
            {
                Damage   = item1.Damage - item2.Damage,
                Defence  = item1.Defence - item2.Defence,
                Strength = item1.Strength - item2.Strength,
                Intel    = item1.Intel - item2.Intel,
                Agility  = item1.Agility - item2.Agility
            };

            itemAttribute.CalculateCompositeAttribute();
            return(itemAttribute);
        }