The ranks of the dark apothecaries includes the greatest amongst the apothecaries. The agents of the Royal Apothecary Society scour the land for the deadliest toxins and most powerful potions, searching for the ultimate weapon in their battle to rid Azeroth of the Scourge.
Learning the secrets of the Royal Apothecary Society allows a dark apothecary to brew potions at incredible speeds. Trained in the proper methods of throwing potions, dark apothecaries may select direction or the shape of the released liquids.
Potions created by a dark apothecary are either imbibed or used by the dark apothecary as a thrown splash weapon. As a result of their extensive alchemical studies, dark apothecaries can identify unknown potions at will.
As the Royal Apothecary Society's classification system uses odor rather than taste (to protect young initiates from mistakenly imbibing poisons), a dark apothecary must be able to smell a potion in order to identify it.
Once initiated into the Royal Apothecary Society, a dark apothecary can cause the effects of a previously-brewed potion to last twice as long as normal.
The blood of a dark apothecary is tainted with toxins from his experiments. A dark apothecary who bleeds himself, can drip the blood into a vial of water to create one dose of poison. Glass vials of this poison can be thrown at enemies.
In time, because dark apothecaries have experimented with so many potions, chemicals and toxins they become immune to the effects of all poisons, as well as gaining the ability to pass poisons via touch.