vampires are poorly done in skyrim. the time between stages should be increased. vampires spells are too weak we need better and powerful spells. and sunlight negative effects should be like these: magicka, health and stamina regenerate 50% slower. instead of horse armor we need a little DLC that fixes these problems and a vampire quest line like companions for werewolves! what do you think?

It should be lore friendly.

Sun damage
Increases in Strength, Speed and Agility
Blood dependancy
Increase in power/ability with age
More in tune with the lore(more mystical and magical)
More feral appearance(and able to conceal appearance with hoods/helmets)
More ways to feed i.e. sneak, quick kill, feed on fallen enemy
Chance to infect
Faction Bloodlines and quests

I'm sure there can be more than this.

What you think of is called a mod.

Can't mod? Well, it sure wasn't me who picked your gaming platform

IMO I think if you go out into the sun you should die.

Please use the existing DLC discussion topic (link below in my signature).