Oh i didnt know , been long time since i played a vamp and it was DiD char

At stage 4 it becomes 100 % resistance

Thanks.
Btw: I read from usep that the vamps in skyrim are a modfied cyrodillic strain.
I think at skyrim there should be 3 vamp options depending from what vamp you got infected.
The volkhair (sorry if i wrote the name wrongly) should be warriors , kind a like werewolves
The cyrodill vamps should be kind of nobles , doing diplomacy and pretening to be human , mage playstayle more
And the vampires that are now, the modified cyrodillic strain should be filthy hybrids , other vamps think them that way, but would be more sneaky bonuses
Plus add a 50hour storyline to each of them and i would be happy
Also you vamp should be able to make minions like in this vidhttp://www.youtube.com/watch?v=FeqwVZaEsgI 1:47
Also at tes lore there is sayed that old vamps are more powerful so the more your char ages , or has been a vamp the more skills he/she should have as a vamp even at stage 1

Right, there's that too. But like many other things in Skyrim, it has very little consequnces. Well, atleast for this there is some, as usually there's nothing. And the getting stronger by not drinking blood is just backwards.

The mod i use makes vampirism a high-risk, high-reward deal, major benefits, but also major downsides. That is something Skyrim is missing, everything is scaled to your level for a comfortable experience.