Dante's Inferno: Secret Relics?

I recently started playing through Dante's Inferno again, This time playing on Hellbound difficulty, And i came across a few relics i hadn't had before, The name of the relics are "The Dark Princes Robe" "The Gate Guardians Standard" and "Anthony's Fearless Heart" none of them have a relic description, Just the level information, When i equip them Dante's powers have no change whatsoever, I was wondering if anyone could inform me as to what the hell they are please? I've looked on all the forums and webpages related to Dante's Inferno, I've even checked the official website for all 5 countries it was released in, I've searched the booklet that comes with the game and I've even purchased unofficial guides to see if they have the information, If you can help me with this it would be very much appreciated, Thanks for reading this and thanks in advance for any help you can give!