Corroded Fossils are Hardmode crafting materials that drop from various enemies in the Acid Rain event after the Aquatic Scourge has been defeated, as well as some post-Aquatic Scourge Sulphurous Sea enemies. They are used to craft several weapons themed around the Acid Rain.
|Caustic Tear (Non-Consumable)||Alchemy Table|
|Music Box (Acidic Downpour)||Ancient Manipulator|
|Acidic Rain Barrel||Mythril Anvil|
- 5-10 Corroded Fossils can additionally be obtained from Abyssal Crates at a 50% drop chance after completing Tier 2 Acid Rain.