I don't know the Item ID so I entered a random number.
I went to @go 36 and talked to the "War Store" NPC and Clicked on "Shadow Shield".
The Doram Physical Shadow Shield and Doram Magical Shadow Shield have incorrect item description.
Some reason it says "+Ninja Shadow Weapon" for the set bonus instead of "+Doram Shadow Weapon"?
If equiped with a Doram Shadow Weapon, does it actually work?
(I don't own these items so I cannot test this out myself.)