Genius DiademEquipment 18
Source Pathfinder Gamemastery Guide
Price 24,000 gp
Weight light
Perception +22; precise vision 30 feet, imprecise hearing 30 feet, constant detect magic
Communication speech (Common, Draconic, and eight other common languages)
Skills Arcana +34, seven Lore skills +28, Occultism +28, Society +28
Int +8, Wis +0, Cha +4
Will +24
The genius diadem is a Diadem of Intellect that typically acts like an arrogant professor or mentor, often boasting that it is a certified greater intellect and far superior to your own intelligence, even after the benefits the diadem grants you. The genius diadem encourages you to learn things for yourself rather than actually attempting to Recall Knowledge for you, though you or your allies might be able to play on its arrogance using Deception to trick it into doing so. In addition to allowing you to activate it, the diadem can use the diadem of intellect's hypercognition activation with its own actions, though if it does so, the diadem gains the benefits instead of you. Only the diadem can use the following activation.
Activate 
command, Interact
Frequency once per hour
Effect The genius diadem casts 7th-level feeblemind.
Traits
This rarity indicates that a rules element is very difficult to find in the game world. A rare feat, spell, item or the like is available to players only if the GM decides to include it in the game, typically through discovery during play. Creatures with this trait are rare. They typically can't be summoned. The DC of Recall Knowledge checks related to these creatures is increased by 5.
ApexWhen you Invest an Item that has the apex trait, it improves one of your ability scores, either increasing it by 2 or to a total of 18, whichever grants the higher score. This gives you all the benefits of the new ability score until the investiture ends. An apex item grants this benefit only the first time it's invested within a 24-hour period, and you can benefit from only one apex item at a time. If you attempt to invest an apex item when you already have one invested, you don't gain the ability score increase, though you do gain any other effects of Investing the Item.
ArcaneThis magic comes from the arcane tradition, which is built on logic and rationality. Anything with this trait is magical.
DivinationThe divination school of magic typically involves obtaining or transferring information, or predicting events.
IntelligentAn item with this trait is intelligent and has its own will and personality, as well as several statistics that most items don't have. Intelligent items can't be crafted by normal means, and they are always rare or unique.