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There is a Legacy version here.

PFS StandardViper's FangItem 14

Consumable Magical Talisman 
Source GM Core pg. 267
Price 850 gp
Usage affixed to a weapon; Bulk
Activate [reaction] (concentrate); 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
When you activate this resin-strengthened viper skull, make a melee Strike against the triggering creature. If you have Reactive Strike, you can activate the viper's fang as a free action. If your attack is a critical hit and the trigger was a manipulate action, you disrupt that action. This Strike doesn't count toward your multiple attack penalty, and your multiple attack penalty doesn't apply to this Strike. If you hit with this attack, the creature is exposed to viper fang venom.

Viper Fang Venom (poison); Saving Throw Fortitude DC 32; Maximum Duration 4 rounds; Stage 1 3d10 poison damage and enfeebled 1.