I think the questline in Dead Money was pretty dark, especially as you explore and begin to learn more and more about the Sierra Madre. A project of love turned into something horrifying thanks to the experiments by BIG MT. Research Facility.

The Cloud deteriorating the health of those who breath it in, the hazmat suits created to test effectiveness against chemical attacks while also trapping those wearing it inside, eventually giving birth to the Ghost People. And as someone who is claustrophobic, there wouldn't be enough money to convince me to climb inside an Auto-Doc that are known to mutilate their patients.

The "One for my baby" quest from Boone is the darkest in my opinion, mainly because after you take him as a companion, you learn that he shot his pregnant wife, to save her from the Legion...

Harold's quest on fallout 3, the talking tree was Harold right? Quite sad and really makes you question the moral choice you have to make: end a man's suffering, or ensure the Return Of flaura and vegetation to the capital wasteland

@Chinpoko117 wrote:

I think the questline in Dead Money was pretty dark, especially as you explore and begin to learn more and more about the Sierra Madre. A project of love turned into something horrifying thanks to the experiments by BIG MT. Research Facility.

The Cloud deteriorating the health of those who breath it in, the hazmat suits created to test effectiveness against chemical attacks while also trapping those wearing it inside, eventually giving birth to the Ghost People. And as someone who is claustrophobic, there wouldn't be enough money to convince me to climb inside an Auto-Doc that are known to mutilate their patients.

Aye I've got agree with you. Dead Money was pretty dark, it gave me the chills when I looked at the backstory of the sierra madre and this was back when I was in my early teens.

Not necessarily any where near the darkest quest, but i can imagine only imagine how scary the situation at camp guardian in new vegas was. I mean to have lakelurks come in the middle of the night and drag you down into their caves kill and eat you. Maybe tear you limb from limb while you're alive. It must have been horrific. I mean you have to guilt private halford into helping you kill the lurks and even then if you get to close to an exit he peaces out.

Honestly, it doesn't seem too dark a quest at all, but in Fallout 4, when investigating the disappearance of Earl Sterling in Diamond City, and on encountering Sterling's mutilated body in the cellar, you kind of get this feeling that it wasn't all sunshine and happiness in the Jewel of the Commonwealth.

Crocker made a huge mistake because of his obsession, got guilt-ridden, mutilated the body, hid the body, and when you encounter him he wants to end it all because he can't handle the guilt of killing someone.

It got dark pretty fast, and even though it's just a simple and small sidequest, it got pretty heavy towards the end.