This potion is a Dark potion likely invented by Lord Voldemort. It was prepared for him by Peter Pettigrew and was used to create Voldemort's rudimentary body, in addition to several spells and something so horrible Rowling was unwilling to describe it, in order to sustain him while he awaited his return to power. Two of its main ingredients were unicorn blood and Nagini's snake venom. The drinker must continuously drink the potion every few hours in order to maintain the little health that they have regained.