The castle is comprised of four levels.
The [Main Hall] where the Great Lord resides is positioned in the dead center of the first floor.
Due to its design, there is no direct passage from the first floor to the [Main Hall].
There are only two scenarios where one can get there.
First, the Great Lord can open a one-way channel through a mechanism within the Main Hall when he needs to convene an important council meeting or see someone in particular.
Second, taking the route to the secret study room on the fourth floor.
In the map that the doctor provided, it was marked that this particular study room concealed a personal elevator. If the correct password is entered, it can take you down to the Main Hall.
Primarily, it is proficient for the Great Lord's wife, housekeeper, and nutritionist whom can use it to visit him at any time.
Currently, many squads are swarming into the castle.