Dreamforge

Suppressed Power: This psionic item is powerful, but you sense that it has not unlocked all of its secrets to you at this time.
 * Upgrade can be made on this attribute at Dreamforge crafting device, in The Dreaming Dark quest
 * Requires:
 * 6 each of 4 Essences, acquired from other quests in the The Dreaming Dark adventure pack Or
 * 6 Crystal Shards of Dreams from the end reward of The Dreaming Dark quest Or
 * 1 Crystal Disc of Dreams from the end reward of The Dreaming Dark quest.

Upgraded item attributes
Items gain following attributes as you perform the upgrade.

The Mindsunder loot

 * Death's Touch - Unholy Burst,
 * Dream Edge - Lesser Vampirism
 * Elocator's Habiliment - Greater Nimbleness
 * Gloves of Titan's Grip -, , Repair Systems
 * Light and Darkness - DR 5/Epic, Bashing
 * Quorforged Docent of Battle - Superior False Life, Toughness
 * Rahl's Might
 * Axiomatic version - Axiomatic Burst
 * Bleed version - Puncturing
 * Force version - Force Burst
 * Impact version - Maiming
 * Shock version - Shocking Burst
 * Regalia of the Phoenix - ,
 * Terror -, Deception

The Reaver's Fate loot

 * Dreamspitter - Holy

Unique Items with Non-Unique Locations
Note that old Ioun Stones without the listed "Suppressed Power" effect can still be upgraded anyway. Also, these are much more common now, as 1 of the 10 types will always appear in the end rewards list for The Dreaming Dark (quest) every 3 completions, and have a chance to appear on every completion. Take note that ioun stones become bound to the character who unsuppresses them, so this must be done on the character who will use the stone.
 * Dark Blue Ioun Stone -, (ML: 5 BtC)
 * Deep Red Ioun Stone - Dexterity Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Dusty Rose Ioun Stone - (ML5, BtC)
 * Incandescent Blue Ioun Stone -, Wisdom Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Pale Blue Ioun Stone -, Strength Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Pale Lavender Ioun Stone - (ML: 5, BtC, Exclusive)
 * Pink Ioun Stone -, Constitution Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Pink and Green Ioun Stone -, Charisma Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Scarlet and Blue Ioun Stone -, Intelligence Skills - Exceptional Bonus +1 (ML: 5, BtC)
 * Vibrant Purple Ioun Stone -, (ML: 5, BtC)