Cocytus

Cocytus (コキュートス Kokyūtosu) is a river in the underworld, as are Styx, Phlegethon, Lethe and Acheron.

Overview
Unlike other rivers in the underworld, Cocytus' entire area is shown to be frozen, and the ice is thick enough for one to walk over in most of its extension. Its immense area makes Cocytus one of the major areas in the underworld, and the river stands in the deepest area of hell, where the division with the Hyperdimension that guards Elysium is located, as well as the temples where the judges and Hades usually reside (that is, Caina, Antenora, Ptolomea and Judecca). The largest area in Cocytus is the Eighth Prison, a plain of ice where those who stand against the gods (such as all the saints who fought in the Holy Wars) are sent after death. The ice is permeable after one's body is dropped and left over it for enough time.

Mythological roots
In the Greek mythology, Cocytus (from the Ancient Greek Κωκυτός, Kōkutós; "lamentation") is a river in Hades that flows into the Acheron. In Inferno, the first cantica of Dante Alighieri's Divina Commedia, Cocytus is the ninth and lowest circle of The Underworld. There, Cocytus is referred to as a frozen lake rather than a river, although it originates from the same source as the other infernal rivers, the tears of a statue called The Old Man of Crete which represents the sins of humanity. Dante describes Cocytus as being the home of traitors and those who committed acts of complex fraud. Depending on the form of their treachery, victims are buried in ice to a varying degree, anywhere from neck-high to completely submerged in ice. Cocytus is divided into four descending "rounds," or sections:


 * Caina: named after the Biblical Cain, where the souls of traitors to blood relatives go to.
 * Antenora, after Antenor from the Iliad, where the souls of traitors to country go to.
 * Ptolomea, named after the Biblical Ptolemy, where the souls of traitors to guests go to. Here it is said that sometimes the soul of a traitor falls to Hell before Atropos cuts the thread, and their body is taken over by a fiend.
 * Judecca, named after the Biblical Judas Iscariot, where the souls of traitors to masters and benefactors go to.

Appearances

 * Saint Seiya (debut)
 * Saint Seiya: The Lost Canvas