The Eerie Fog - The thick fog surrounds you - "Did that move", "Was is always there", "I think I heard something" - the feeling of not being alone...
A pillar made out of dirt? Was somebody making a mark or? And what's up that dead tree?
You have removed hunger, being closer to pre-beta 1.8. And of course with that, removing sprint mechanic.
Complete darkness, only with your torchers you can travers caves. Optifine is highly adviced!