Stone of Unrivaled SkillEquipment 17
Source Pathfinder Dark Archive
Weight negligible
You traded your senses to a hag for unrivaled expertise stolen from various souls who were once the greatest in their field. Your bargained contract is sealed by sleeping with a pitch-black stone under your pillow every night. Choose one skill when you seal this bargained contract. You become an expert in that skill; if you were already an expert, you become a master, and if you were already a master, you become legendary. Once per day, from any distance, the hag that holds your contract can take over your senses for 10 minutes, during which time the hag hears, sees, smells, tastes, and feels everything you would typically experience. During this time, you are Dazzled by your own disjointed senses.
Activate 
command
Frequency once per day
Effect You place the stone sealing your bargained contract in your mouth. For the next 10 minutes, you gain a +3 status bonus to skill checks using the skill you chose for your contract.
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.
ContractA contract is a type of item that magically establishes an agreement between multiple parties and typically grants magical benefits.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.