No Stone Unturned

"Hehe, it should be fun," said the woman in her mid-thirties as she cracked her neck. Warden Estelle had left, leaving us to our own. 

From what the teacher told me, the Devil's Gate is just like a normal Grimm Battlefield; after entering here, we have to register Pyramid before finding a place for one to stay.

The only way it is different is that the mortality rate is quite high; more than one-third of people that come here die, but those who survive here became quite powerful.

There is a usual danger of other criminals and Grimm Monsters, who are also present here; there is no way our mortal enemies would not use such a place to train their people like us and like us; they also send their criminals here who are the worst than the human criminals.

But the Grimm Monster and criminal humans are not the biggest danger here; the biggest danger here is the environment of the Devil's gate, which kills directly and indirectly, mostly indirectly.