Tirnus Cave - West Cavern

This large cavern is dimly lit with light coming in from a large opening across the room. The lights flicker and dance which give the illusion that the lights aren't quite what they appear to be. Meanwhile across the cavern in the shadows, you're sure you can see the lights catching on what appears to be a giant face embedded in one of the walls. Is this just another illusion perhaps or something lurking in the gloom?