Chitin

Each destroyed hit area requests its own drop list. Bounds and weights are authored inputs, not total deposit yield or percentages. Resource modifiers, one-of-each selection and runtime randomness affect the result; null means no independent entry chance is specified.

Chitin has no ordinary crafting recipe in the active recipe registry. Obtain it through the listed sources: Coral Cod, Leviathan, leviathan. The linked uses show what it contributes to; an ingredient requirement is not a recipe for making this item.