Swarmeater's ClaspEquipment 8
Source Pathfinder #158: Sixty Feet Under
Price 460 gp
Weight negligible
These small brooches usually feature carved reliefs of verminous, swarming creatures. When you wear the clasp, you gain resistance 10 to physical damage from swarm creatures.
Activate 
>Interact, manipulate
Frequency once per day
Requirements a swarm creature is within your reach
Effect You thrust your hand into the swarm, draw forth a squirming mass of vermin, and devour it. You recover 3d10+8 Hit Points and deal the same amount of bludgeoning damage to the swarm. The Hit Point recovery is a positive healing effect.
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.
AbjurationEffects and magic items with this trait are associated with the abjuration school of magic, typically involving protection or wards.
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.