Steel Devil Style is actually in CB: Night.  It's the top of a chain of two-weapon fighting Charms.  As long as it's active, you automatically parry and counterattack everything, but you must be holding two weapons and can't use Extra Action Charms.<br/><br/>And I don't see the balance issues with Abyssals, unless you count the Necromancy background.<br/><br/>Infernal Exalted<strong>are</strong>akuma (specifically, Exalted akuma).