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PFS StandardViper's FangItem 14

Source Core Rulebook pg. 569
Price 850 gp
Usage affixed to a weapon
When you activate this resin-strengthened viper skull, you make an Attack of Opportunity against the triggering creature.

If you have Attack of Opportunity, you can activate the viper’s fang as a free action.

Activate ReactionReaction Envision; Trigger A creature within your reach uses a manipulate or move action, makes a ranged attack, or leaves a square during a moving action it's using; Requirements You are a master with the affixed weapon