I would like to see a mod that adds a injury system. Kind of like in Fallout 3, only with more harsh consequences. Taking enough damage to your arm would result in your arm breaking, making you unable to wield any weapons with that arm. Taking damage to one of your legs would make you walk with a limp and unable to sprint. And if both your legs were hurt enough you'd be forced to crawl until you could heal yourself, pretty much leaving you defenseless. This should also work against enemies. It would be cool if you could disable your enemy, before you do the final killing blow.... Or just take his stuff and leave him there! Then you could defend yourself and not have to kill them if you didn't want to Mods that add more depth to combat, like deadly reflex or unnecessary violence. More spells and magic schools. More everlasting curses that are so powerful that you need to see a healer to have them removed. Maybe certain powerful items could be cursed. Like that sword in Baldurs Gate that wouldn't let you unequip it and made you go berserk occasionally attacking everyone around you. Snowstorms and hurricanes! Being forced to take shelter in a cave for an hour or two. A small chance of your helmet getting knocked off when you receive a blow to the head. Real low. Chance of being robbed by other thieves while in a city. Maybe by the thief guild and then joining them could make them leave you alone. Stalking animals and enemies. Like a pack of wolves that follows you from a distance, waiting until you're hurt or defenseless before attacking. Or a bounty hunter that waits for the best moment to attack. Not sure if that's possible. But it would be pretty awesome to be hunted by someone or something when you're out in the deep woods all by yourself :)