Potions of longevity were magical potions that reduced the drinker's age by a number of years, potentially extending their lifespan. An amber-colored liquid, its sealed vial revealed a number of objects suspended in the liquid: a scorpion's tail, an adder's fang, a dead spider, and a still-beating heart. Upon opening the vial, the suspended objects disappeared.
When a creature drank a potion of longevity, its age was reduced by between 7 and 12 years. The potion could not make an individual return to an age less than 13 years old. Repeated use of potions of longevity was dangerous, however. After each subsequent use, there was a small but growing risk that the potion might instead increase the drinker's age. After the tenth use, age reduction became impossible and the potion could only make the drinker older.