GO AWAY IF YOU WANNA GO DARK
http://www.gamepro.com/article/previews/216005/halo-reach-campaign/
“Helping to reinforce that slight sense of uneasiness is a creepy stretch later in Nightfall. As we travel down this valley, the music shifts to a more haunting mood as rain comes pit-pattering down, with thunder and lightning occasionally piercing the tension and lighting up the dark, shadowy surroundings. This is no survival-horror game by any means, and this is just one part of one level out of many, but it hasn’t been since we first encountered the Flood in Combat Evolved that we got a tinge scared in a Halo game.”
That sounds awesome.