Corrosion is an alchemy formula. It is taught by an alchemist found in Ebon Keep Sewers. It can be considered a variant of Acid Rain.


Corrosion deals 9-21 damage to all enemies on-screen, and then deals continuous damage to them for a period of time, inflict 4-10 damage every 2 seconds.

Corrosion is of little use, the major problem being that its damage does not increase as it levels up, and the damage it does is minimal. However, it does have a niche use in that it is the only alchemy formula the player gets that affects all enemies on-screen, while other formulas can only target up to three enemies. This makes Corrosion useful when facing multiple weak enemies.


Corrosion requires 1 part Mushroom and 3 parts Water for each casting.