Viper’s Fang Item 14

Pathfinder Core Rulebook (Second Edition), page 569

Category Consumables; Price 850 gp; Usage affixed to a weapon; Bulk —

Activate ↩ envision; Trigger A creature within your reach uses a manipulate or move action, makes a ranged attack, or leaves a square during a move action it’s using; Requirements

You are a master with the affixed 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.