Warrior's Training RingEquipment 5
Source Pathfinder Adventure: The Fall of Plaguestone
Price 160 gp
Weight negligible
This ring is utilitarian in design-indicating its martial use. Its band is decorated only with a simple, sharp-edged sculpture on the band's center. While wearing this ring, you add your level to your attack rolls with all weapons with which you are untrained.
Activate 
envision
Frequency once per day
Trigger You make an attack with a weapon in which you're untrained
Effect You gain a +2 circumstance bonus to the attack roll. If you are an expert in any weapon, you instead gain a +4 circumstance bonus to the attack roll.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
DivinationThe divination school of magic typically involves obtaining or transferring information, or predicting events.
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).