From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Reflecting Shard (Greater)

ITEM 17

UNCOMMON CONSUMABLE MAGICAL TALISMAN

Price 2500 gp

Usage affixed to a shield

Bulk —

Category talisman

Activate (concentrate)

Trigger You are targeted by a spell of any rank.

Requirements You're a master in Athletics, and you have the affixed shield raised.

This mirrored metal fragment is bolted or welded to the face of the affixed shield. When you Activate it, you attempt to reflect the triggering spell back at its caster with Spell Riposte, using your Athletics modifier for the counteract check. The talisman's counteract rank is 9th.

Pathfinder Treasure Vault (Remastered)ORC