Tartarus (奈落, Tarutarosu), also known as the Pits of Tartarus and the Prison of the Gods, is a place in Hell that is used as a prison for the Titans, the Demons and Siegfried.
Plot[]
Past[]
After the Titanomachy Tournament, the remaining Titans were imprisoned in the pits of Tartarus.
The Titans take advantage of the Gigantomachy to escape from Tartarus
During the Gigantomachy, the Titans escaped from Tartarus and Hades decided to fight them on his lonesome, successfully repelling all of them using the power of his Ichor-Desmos.
However, they would eventually be freed by Adamas and would aid him in his attempt to overthrow Zeus. After Adamas' "death" at the hands of Poseidon, it is unknown what happened to the Titans.
At some point in time, Siegfried was imprisoned in Tartarus.