A variation of this could be based off a bug I once had in a game I was making. I was trying to dim a light-emitting object until it emitted no light. The bug was the light intensity didn't stop at zero, but became negative. This made it look like the object was sucking light around it. The actual object was black, and you couldn't see anything around its immediate area. The further you got from the object, the more of the floor and walls you could see.
Imagine if you had an enemy in your game that could darken the areas around it. It could slowly home in on the player. Maybe it doesn't kill the player, but if it got close enough you wouldn't be able to see the maze, making movement difficult. Your only hope would be to try random movements until you got far enough away. It could be stress-inducing.!@yi8
