Shadow EssenceConsumable 10
Source Pathfinder Core Rulebook
Price 160 gp
Weight light
Distilled from the Plane of Shadow, this oily substance imposes tenebrous effects. The enfeebled condition from shadow essence lasts for 24 hours.
Activate 
Interact (Injury)
Saving Throw DC 29 fortitude
Maximum Duration 6 rounds
Stage 1 3d6 negative damage and 2d6 poison damage (1 round)
Stage 2 3d6 negative damage, 2d6 poison damage, and Enfeebled 1 (1 round)
Stage 3 3d6 negative damage, 2d6 poison damage, and enfeebled 2 (1 round)
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AlchemicalAlchemical items are powered by reactions of alchemical reagents. Alchemical items aren't magical and don't radiate a magical aura.
ConsumableAn item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
InjuryThis poison is delivered by damaging the recipient.
NegativeEffects with this trait heal undead creatures with negative energy, deal negative damage to living creatures, or manipulate negative energy.
PoisonAn effect with this trait delivers a poison or deals poison damage. An item with this trait is poisonous and might cause an affliction.