The Devil's Castanet, also known as the FangShel, Deathtanet, and Death Shell, is an enemy from Final Fantasy IV. It appears in the Ancient Waterway, normally in groups alongside its cousin, the Fangshell, whom it is stronger than. However, they are quickly dealt with with a simple Thundara spell from either Tellah or Palom, or by the twins' Pyroblast Twin ability. They are of no threat.