I think, to make a great horror mod for a game, one should emulate the horrors of reality. Universally, people fear the unknown, as well as helplessness. A few things I can think of that fit those two things:

- Enemies that vanish from sight and reappear at differing locations, perhaps behind the player or someplace nearer than they were.
- Low-level lighting, and lights that dimly flicker
- Fog or mist
- Awareness by the player of a very real potential to be slowed or paralyzed
- Immersion into a world where the usual laws of physics are broken, causing the player to question the certainty of the way the environment will react to their actions.
- The sounds or sights of other in agony or despair
- Sensory clues that indicate impending doom (a familiar sound or image the player would associate with a situation that they feel certain would result in helplessness or fatality)
- The ever-present knowledge that you are at the mercy of entities more powerful than yourself
- Having few or no allies, and those that do exist show signs of being as equally vulnerable and afraid as yourself
- Having the character build trust with someone, only to be betrayed

These are the easiest for me to recommend. Not at all an all-inclusive list, but it should help to attune your mind's creativity to the aspects of horror.

Explosion like sounds from a firebomb from complete silence
I was creeping around in a cave trying to kill these one creature like witches and their firebomb spell or whatever it was gave me the jumps the first few times lol mainly because I keep my volume up kinda high
Then another instance was when I was at one of Legate Rikke's camps and just as I was about to leave I pressed what I thought was the sprint button but I pressed the power button (RB Xbox360) anyway I happened to have the Firebreath shout selected and well it scared the crap out of me because I wasn't expecting it lol my mind was preoccupied thinking of other things pertaining to Skyrim

LOL i do that too xD

Damnit guys! You're all giving way too good of advice! I still have to make the base mod. (like 7 months and 1300 hours of estimated work) You're all making me want to just make the horror mod now but I cant! I honestly didn't expect this level of input. But keep it going! I can plan now, then have a lot more to go off when I actually make the mod!

Pretty much every sudden moves from behind.. Everything from a wolf sneak attacking me. Bandits dont scare me cause usually i just see an arrow flying past me cause they cant hit for squat if its further then 5 feet away

Big things creatures in the water

The putty-faced models from Oblivion.

Scare the living [censored] out of me.

Take a look at amnesia the dark descent and all your questions will be answered!

While I have never played that game I have heard that it is indeed fantastic. However I could only immitate it oh so well, so I need other stuff to compensate. Like, I'm not sure if being completely defenseless is an option. I could prevent using weapons (including magic) if the game works anything like previous BGS titles, and it should. However I'm not sure if I could disable dragon shouts... I could try, I'm sure they have something for that. Then it's just me scripting eerie sounds, crazy enemies and environments, and tying it all together with a good story.... how hard can it be?

A dungeon in Oblivion did something that I thought was kinda cool / scary. There is no enemies when you go into the dungeon, but when you go deeper in and grab the Ayleid statue, the place is all of a sudden crawling with undead, so you have to get through them to escape.

Can skeletons be reanimated? A place could be filled with dead (more dead) skeletons, but a scripted event could cause the skeletons to reanimate and attack.

Minecraft is the scariest game I have ever played, not even kidding. Your all alone in a huge world, with only mentally challenged livestock that jumps around and evil creatures of the night. For your mod, I suggest making it very large but without NPC's that talk to you, or maybe around 2 if you need to. Make it dark and a swamp or forest full of dead trees would be a good environment, something like that moor at night time outside Morthal (that place gives me the creeps). Make sure enemies are twisted looking, something like The Harvester or the Broodmother bosses from Dragon Age.

Hmmmm. I won't have (or at least it's not planned as of now) a modeler for new creatures. I have a friend who is just getting into modeling who will be making me some objects, but thats it. So I will have to stick to that which is already in the game, but I can deal with it. Look what I did with Deimos and Project Genesis. I made some pretty crazy unique stuff by duct taping together a bunch of vanilla objects.

Bumpity bump. Come on guys, you all have had such great input so far!

Those damn Hagravens really freak me out, just look at them: http://www.made2game.com/uploads/tinymce/images/skyrim-hagraven.jpg, I don't know why, but it's something to do with how it was once human, but got genetically re-arranged, like Ghouls in Fallout.

BEARS!!!

The ominous feeling of not knowing whether something is going to jump out and attack me while walking alone in the dark with a huge ass snowstorm blowing between two mountains. At least that's what gets me every time I play Skyrim.

Anyone planning on making a horror game/mod should play Amnesia. That game has everything a good horror game should have.

I hate spiders!

The game freezing when i haven't saved in a while. :rofl:

CTDs

Falmer dungeons have a way of keeping me on my toes.

Hearing voices and seeing things rank high on my list. Especially if you are seeing multiple monsters and one of them is real. Never know which one is real. A game that did an ecellent job of this was I believe Sancutary on the GameCube. By far the best horror game I have played. Unfortunately I do not think many of these things are possible in Skyrim, then again, I may be wrong.

Totally. Someone already said it, but sound is important; you don't necessarily need things to pop out and scare us because we can scare ourselves. Disembodied footsteps, the creaking of bones, or scratching sounds from the walls could do it. If you haven't played Amnesia, it's an awesome game to take notes on what's scary.

Having a follower follow you into a deep dungeon then finding out in a letter that your follower is a serial killer. The turning around process is freaky.

Ambient sounds.And not being able to kill anyone.Being alone.Darkness.