One of the features retained from Oblivion, you can still contract Sanguinare Vampiris, a disease that amplify existing belief in the existence of vampires to manifest characteristics of vampires in people.
Vampirism isn’t contracted instantly – there are four stages and the effects of vampirism are amplified with each stage. As a vampire, you are immune to disease and poison. You are resistance to Frost and harder to detect when sneaking. Your Illusion Spells are 25% more powerful.
Your resistance to frost increases by 25% and your attributes are reduced by 15 points. Your weakness to fire is increased by 25% but to balance these affects, you gain Vampire’s sight, Vampiric Drain, and Vampire’s Servant abilities.
Your resistant to frost increases by 50% and weakness to fire increases by 50%. Your attributes are reduced by 30 points but you gain Vampire Seduction ability.
Your resistance to frost is increased by 75% and attributes are reduced by 45 points. Weakness to fire is increased by 75% and your current vampire abilities gain strength.
Your resistance to frost is increased by 100% and attributes are reduced by 60 points. Your weakness to fire is increased by 100% and you gain abilities like Embrace of Shadows and enhanced Vampiric Drain and Vampire’s Servant. At Stage 4, you will be attacked by the citizens of Skyrim for being a vampire. If you are Stealth-type character, you can get the most out of Vampirism, but it may get difficult at Stage 4 for other type of characters.
How To Become A Vampire
To contract Vampirism, you need to come in contact with another vampire. Each hit by a vampire has a chance of passing Sanguinare Vampiris disease onto you. Transformation takes time as I have already explained above, that once the diseases has been contracted, you will slowly transform into a vampire.