The corridor is changing direction and lead to the gallery. You will find a terrace, where is wooden box with Mana Potion. After several fights you are in room with cells again. Turn left, on right side is dragon box with Mana Potion and Health Potion. Go straight ahead. You will hear voices - Acolytes! Kill them and go to the room on the left. Leave this place quickly ( this is the room, where Acolytes study). Try to hide in the shadow and go on.
Left side of gallery
This corridor is very long...
Remember that shadow is your ally.
The place, where Acolytes normally are studying... kind of classroom...?
Is it using to study?
Go upstairs, go downstairs. You will come to the Library. There are Acolytes and Black Guard's too. Kill all of them. Go to the ground floor. Take Vampire Knight's Shield! There will be locked door. You need a special key to open it. Go to the gym. The training has already started. Use Fire Traps and leave the gym. Set up Fire Traps, because those of enemies, which are still alive will follow you.
... and go downstairs...
One is dead, but there are more enemies...
Set up Fire Traps.
Another one is dead...
Closer and closer to exit....
Another locked door... You need the key!
Vampire Knight's Shield
Kill all enemies!
They hung this man.. Awful...
Is he sleeping?
No, he is dead.