Antenora

Antenora is the fourth door in the Abyss of Time. At the X floor, there is a door into X's past.

Bosses
The X is found on the Xth floor of Antenora, accompanied with

The X is found on the Xth floor, accompanied with

Trivia
In Inferno, the first cantica of Dante's Divine Comedy, Cocytus is the ninth and lowest circle of Hell and is divided into four descending "rounds," or sections. Antenora is the second of that sections, named after Antenor from the Iliad and where traitors to country are.