How did you implement the theme?
Storm is out, light is out and now something else is about. Use light to your advantage and create safe rooms that the monster won't think twice about entering.

How did you add the special object?
The main gameplay loop involves opening timed curtains to dispatch the monster, it is also a weapon to stun the enemy. You have have every curtain open at the same time to dispatch the monster, check your pause menu using ESC to see the status of each room.