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

Sanguine Fang

ITEM 9
MAGICALSPELLHEARTVOID
Price 650 gp
Usage affixed to armor or a weapon
Bulk —

A pointed vampire fang hovers within this smoked-glass vial, its tip crimson with slowly dripping blood. The spell DC of any spell cast by activating this item is 25.

  • Armor You gain resistance 3 to persistent bleed damage and a +2 item bonus on saving throws against effects with the void trait.
  • Weapon After you cast a spell by activating the fang, your Strikes with the weapon deal 1d4 persistent bleed damage until the end of your next turn.

Effect: Sanguine Fang - Armor

Effect: Sanguine Fang - Weapon

Activate Cast a Spell
Effect You cast Void Warp.
Activate Cast a Spell
Frequency once per day
Effect You cast Vampiric Feast.
Pathfinder Treasure Vault (Remastered)ORC