Potions are items purchased from none other than the Mad Scientist (found under World). When used on a waja, they add one of the 9 Potion Mutations to the waja. Once added, the mutation is permanent, cannot be removed, and is inherited the same way that Custom Mutations are.
The potions offered by the Mad Scientist are not purchased with WC. Instead, the player must trade one accessory of any kind as well as a certain number of the four ingredients found randomly in the Mining game (Rock, Crystal Shard, Roots, and Earthworm). For more information on potions and how to create them, please see the Mad Scientist page.
As of November 25, 2017, potions may now be found while Mining in the Murky Forest.