Dear Friends:
Here is the end result upgrade on the "Light and Darkness" shield from the Mindsunder quest (Upgraded inside the Dreaming Dark quest at the Dreamforge crafting alter): +5 Enhancement Bonus, Superior Stability, Protection +4, Resistance +4, DR 3/-, Adamantine, Mithral, DR 5/ (Only epic creatures are exempt from this), and Bashing.
Please note that you will need 6 pie pieces of each color (total 24) in order to upgrade. Once you are at the Dreamforge crafting alter, put in all 24 total of your pie pieces and crunch them. Then, you put in your newly made crystal formed from these pie pieces and your item to be upgraded and you have now unlocked the suppressed powers. I hope this helps anyone who may be wanting to upgrade their "Light and Darkness" shield.
Happy Questing,
VALOIR WILDFIRE
(Proud Officer in the Loreseekers Guild)
P.S. I don't know if there are other upgrades available or not, but this is what my upgrade gave me when I did it on 12-17-09.