...One of you Winx...
The Shadow Mirror belongs to Tinkerbell. Fixed in the wall of her lair in the World of Dreams, Tinkerbell uses it in conjunction with her Shadow Creatures to spy on the Winx. The mirror can create any image Tinkerbell wishes, so long as the image does not have a force surrounding itself that resists the magic of the mirror. Shadow Creatures reside in the mirror and will on occasion release themselves from the mirror upon Tinkerbell's request.
The Shadow Mirror is a warped, diamond-like shape. When activated, it glows dark blue with light blue on the sides and corners. Puffs of a grey and dark green smoke-like substance dance in the mirror when it attempts to focus on an image.