The original items will still be offered at an HP price, and Deal with the Devil precedent will not be obtained. If used in a Devil Room or the Black Market, the duplicated items can be taken for free.If used on the The Polaroid and The Negative after defeating Mom, the duplicates can be taken without affecting the originals.Taking one of the original items does not cause the duplicates to disappear. If used in the Boss Rush room, all available items will be duplicated and all the duplicates can be taken ( this will still start the Boss Rush) however, only one of the original items may be taken.If used in a Shop, the duplicated pickups and items can be taken for free.Using Diplopia on an empty item pedestal will spawn another random item.Using Diplopia on a trinket does nothing.
