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There is a Legacy version here.

PFS StandardShadow SignetItem 10

Invested Magical 
Source GM Core pg. 295 2.0
Price 1,000 gp
Usage worn; Bulk
This obsidian ring allows you to partially warp your spells through the Netherworld, allowing them to strike directly at a target's body.

Activate [free-action] (concentrate, spellshape); 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.