Philosopher's Stone

The Philosopher's Stone is a Hardmode Accessory that reduces the 1 minute Potion Sickness debuff cooldown time by 15 seconds, so that the cooldown is only 45 seconds. Essentially this means that most regenerative Potions can be used more often. It is dropped by Mimics.

Trivia

 * The philosopher's stone is a legendary alchemical substance, typically believed to turn certain metals into gold and create an elixir that provided eternal life.