1. A plot. A plot could be really cool.
2. Werewolves. I missed them so much, the fluffy, howling wolfie guys. Good times.
3. Make both vampirism and lycanthropy actual CURSES. Or diseases, I don't mind of you want to get scientific with me. Guys go around and let vampires infect them on freaking peurpose. Because vampirism is a blessing.
Vampires WILL get some advantages. Maybe some attribute bonuses or whatever(SMALL ONES). They would ALSO get weaknesses. Make them BURN in the sun. Make it so that they die or freak out if they can't get their blood.Make them incapble of communicating with normal people. Make hunters chase them. The more time a player spends as a vamp, the more powers he get's, but the worse the penalties become. Several "sub races" or clans of vampures will exist, each with different powers.
Werewolves WILL get some advantages. Maybe some attribute bonuses or whatever(SMALL ONES). They would ALSO get weaknesses. When the moon is full they transform and they have to kill people or they will be severly weakned the day after. Make them suffer terrible damage from silver. Make them incapble of communicating with normal people. Make animals afraid of them. Make hunters chase them. The more time a player spends as a were, the more powers he get's, but the worse the penalties become. Several "sub races" or clans of werewolves will exist, each with different powers.
4. A much, much, much bigger world. A HUGE world, with HUGE cities.
5. Mounted combat.
6. Noble titles, being able to gain or lose land, build on eat, train armies.
7. Buying a ship and hiring a crew so that you can explore far shores. Ship to ship combat.
............
Yes, I know I am asking for too much and that it is all impossibly ridiculus. But... Well, that's what I wish for in my next ES game.