You see the lights flicker more then usual. When you open the next door, you suddenly feel everything shift; the air, the smell, the feel, everything about the room. Your vision is black before it goes back to normal.

You are in a long hallway, and you hear an odd noise that sounds like distorted grumbling and clicking. The hallway is dark, only illuminated by the eyes of an entity in front of you with bright, cyan glowing eyes. "HALT! TURN AROUND! RUN AWAY!"