Emerald Potion

The Emerald Green Potion is a mysterious and unnamed potion which induces fear, delirium and extreme thirst. It is highly debilitating and will cause death if left untreated. It cannot be penetrated by hand, vanished, parted, scooped up, siphoned away, transfigured, charmed, or made to change its nature in anyway. It can only be drained away by drinking.

Lord Voldemort used this potion to protect the Horcrux of Salazar Slytherin's locket within the Horcrux Cave.

While its effects are not completely known, the potion could cause the drinker to relive horrible memories. It did cause Albus Dumbledore to either imagine or remember horrific events from his past. His screams of "kill me" could either indicate a resurfacing of the memory of his sister's death (as in, "kill me instead") or a request to be delivered from the horrible pain he was experiencing. It also causes the drinker to become extremely thirsty, and forces the drinker to attempt to drink water from the Horcrux Cave lake, causing the Inferi to attack.

Appearances

 * Harry Potter and the Half-Blood Prince