Blobfish

The Blobfish is a Hardmode enemy that can be found within the Aquatic Depths biome. It moves slowly and occasionally does a Spin attack, suddenly flinging itself at the player to deal contact damage, similarly to a Giant Tortoise.

Trivia

 * In the real world, the is native to the deep waters off the coast of mainland Australia and Tasmania.
 * Its bulbous appearance is merely an effect of decompression on its body in areas of lower pressure. In its natural environment, a blobfish looks largely unremarkable.