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.

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

The Mindsunder loot

 * Death's Touch - Unholy Burst, Greater Necromancy Focus
 * 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 - Greater Evocation Focus,
 * 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.
 * This item.. - ...becomes this item when unsuppressed
 * 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)