Vile Powder is an item that can be used to craft Worm Food and Poisoned Knives. Throwing Vile Powder onto Hallowed grass, Pearlsand, or Pearlstone will convert those blocks to their neutral counterparts, though it cannot be used to corrupt grass, sand, or stone. Tossing Vile Powder at a Bunny or Goldfish will transform it into a Corrupt Bunny or Corrupt Goldfish, respectively.