Purity

Purity in an unlockable lunar item in Risk of Rain 2. It is unlocked by beating the game on Monsoon difficulty. (Note: obliterating does not count you must kill Mithrix)

Purity reduces the characters ability cooldowns by two second, but in turn grants them a reverse 57 Leaf Clover effect. In practice, all chances for something good to happen are rolled again if they would have been successful. (example: Lens-Maker's Glasses, if it is successful it is rolled again, effectively taking double the amount to guarantee success)

(Note: 57 Leaf Clover and Purity cancel each other out)