Like other winged Cie'th, they frequently evade physical attacks. They are usually encountered with other, low-ranking winged Cie'th and should be prioritized. Their powerful Lightning-based spell Levinbolt also deals heavy damage, and they are able to inflict Imperil to amplify the damage output.
Cocytus, meaning "the river of wailing," is a river in the underworld in Greek mythology. In Dante's Inferno, Cocytus is the ninth and lowest circle of Hell where traitors are frozen in a lake of ice, Satan is imprisoned waist deep in ice at the very center of Hell. There are several other new Cie'th in Final Fantasy XIII-2 named after elements from Inferno, which lends weight to it being the intended reference.
- The Cocytus is the only winged Cie'th with a signature spell in Final Fantasy XIII-2.