"A dark mysterious emblem found in Dol Guldur. This can be exchanged in Emyn Lum."
Quoted from: Aruen
This is a barter item which trades in for gloves that always have +30 Radiance on them. To equip the gloves, you must be level 65.
This item drops from "Cargaraf and Morgaraf", the second boss team in the "Barad Guldur" raid instance. In my opinion, you need to be level 65 and have 115+ Radiance to venture into Barad Guldur.