I know saying “Don’t google this” will just make people google it, but don’t say I didn’t warn you when you google “Carbuncle” and don’t add “animal” or “mythology” or something alongside it and get an eyefull of cluster boils that you didn’t want to see. The problem comes because the word comes from the latin word for both “precious stone” and “pustule” and it gets used for both, unfortunately.

Anyway the mythical carbuncle is a nebulous mammal with a gemstone in its head that shows up around mines. The most famous modern depictions are probably in the Final Fantasy games.