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From Pathfinder #213: Thirst for Blood, which isn't enabled.

Blood-Drinker Blade

ITEM 5
UNCOMMONAGILEFINESSEMAGICALVERSATILE-S
Price 160 gp
Usage held in 1 hand
Bulk L
Category martial
Group sword
Damage 1d6 piercing

This +1 striking shortsword has the design of a fanged mouth carved into the handle. Whenever the blade draws blood, it glows with a dull red energy, as if empowered by the taste of blood.

Activate—Drink Life (concentration)
Frequency once per day
Effect The blood-drinker blade guides your hand to cut a foe and feeds you from their blood. Make a Strike with the blade. On a hit, the attack deals an additional 1d8 persistent bleed damage. You also gain 1d8 temporary Hit Points for 1 minute.

Effect: Blood-Drinker Blade

Pathfinder #213: Thirst for BloodORC