Mesmerizing Opal
Item 2ConsumableEnchantmentMagicalTalismanSource Core Rulebook pg. 568 1.1Price 7 gp
Usage affixed to armor
Activate 
envision;
Trigger You attempt a Deception check to Feint, but you haven't rolled yet
This silver-bound opal pendant is afire with iridescence. When you activate it, if the outcome of your triggering Deception check is a critical failure, you get a failure instead (or if the outcome is a success, you get a critical success instead).