Amphibiyte Lung is a trading item. It is used for spawning the boss Corallus.
Amphibiyte Lungs can be obtained as a drop from the following mobs:
Dropping an Amphibiyte Lung in water will spawn Corallus. This can be done in any dimension where water is present. If there is enough space available, Corallus will spawn after several seconds, and the Amphibiyte Lung will be consumed.
The Amphibiyte Lung will not spawn Corallus if the difficulty is on Peaceful.