| Dropped by | ||
|---|---|---|
| Entity | Quantity | Rate |
| Flak Crab Orthocera Sulphurous Skater Trilobite | 1-3 | 33.33% (Tier 2) 6.67% (Tier 3) |
| Anthozoan Crab Belching Coral | 1 | 6.67% |
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.
Crafting
Used in
| Result | Ingredients | Crafting station |
|---|---|---|
 Acidic Rain Barrel |
|  Iron Anvilor  Lead Anvil |
 Bonebreaker |
| |
 Corroded Caustibow |
| |
 Miasma |
|
Notes
- 1-3 Corroded Fossils can additionally be obtained from Abyssal Crates at a 10% drop chance after completing Tier 2 Acid Rain.
