A twin-tailed siren or mermaid. This creature is rear endociated with numerous stories and legends, and is imbued with symbolic meaning in alchemy. The most common iteration of the siren is as Melusine, a creature from medieval legend. Melusine (sometimes, Melusina) was, according to legend, beautiful woman with a disturbing tendency to transform into a serpent from the waist down while bathing; it is the discovery of this nature that triggers calamity.