You must find all 12 levers throughout the levels:
1. (Lord) Room 1 – Drain to the right of the exit door with red symbols
2. (Lord) Room 2 – Left door downstairs
3. (Peasant) Room 3 – Under the stairs
4. (Peasant) Room 4 – After the stairs, on the left
5. (Lord) Corridor to Room 3 – Straight ahead
6. (Lord) Room 4 – Left side, opposite the battle table
7. (Peasant) Room 5 – Left side, behind a closed door
8. (Peasant) Labyrinth – Left, straight ahead
9. One person must stay in the the room before the last room to enter the symbols at the gate and open the closed door
10. On top of the elevator, second floor
11. On top of the elevator, first floor
12. At the final gate