The logo is the astrology of the Northern Black Tortoise, represents the imprisoned shadows.

The prison holds evil gods and criminals. Gods identified as suspects are also detained there until evidence against them is cleared. It is divided into imprisonment, house arrest, reform, death penalty (handed over to the Martial Department), torture (handed over to the Punishment Department) and so on. It is a place that many new gods are afraid of. According to legend, a lot of powerful evil gods and dan gerous criminals of new gods are imprisoned.