The dark victory armour is the first secret boss in Despairing Souls. It is a shadowy version of a normal victory armour.
The shadow victory armour can only be fought if you enter the Cave Entrance in the Other Castle. Even so, you need the shadowed key, a key found in the Castle Storage.It has all of the victory armour attacks (slash, fire slash) but is insanely fast and can do a shadow slash. He can later shoot a shadow laser and dash. It has 5555 HP