Shadow SignetEquipment 10
Source Pathfinder Secrets of Magic
Price 1,000 gp
Weight negligible
This obsidian ring allows you to partially warp your spells through the Shadow Plane, allowing them to strike directly at a target's body.
Activate 
command (metamagic)
Effect If your next action is to Cast a Spell that requires a spell attack roll against Armor Class, choose Fortitude DC or Reflex DC. You make your spell attack roll against that defense instead of AC. If the spell has multiple targets, the choice of DC applies to all of them.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
EvocationEffects and magic items with this trait are associated with the evocation school of magic, typically involving energy and elemental forces.
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.