This mod overhauls vampirism. 

The central change is how stages are handled. Inspired by the Sacrosanct skyrim mod, Each stage of vampirism isn't treated as "weaker" or "stronger", instead, well-fed vampires are Manipulators - charming and subtle - While starved vampires are feral predators, swift and brutal.

Traits :
Vampires always have the following traits :

Night Eye - Now a passive trait. As this mod now requires Av Latta Magicka, you can toggle it using the  hotkey function of that mod.
Waterbreathing - The undead do not need to breathe.
Fortify Sneak -  Whether in manipulator or predator stages, all Vampires get +20 to sneak.
Immunities - Immune to disease, poison, and paralysis.
Resist Normal Weapons - Scales from 10-25% based on stage.

Weaknesses :
Vampires have the following Weaknesses : 

Reduced Healing - Reduces effectiveness of restore health, scaling from 25-100%. Note that this does not affect absorb health.
Weakness to fire - Scales from 25-100%. 
Sunlight -  Sunlight weakness scales from 0-8.

Attributes and Skills:
Vampires gain and lose certain attributes. 

Manipulator Attributes - Fortifies Personality and Willpower. Fortifies Illusion, Speechcraft, and Mercantile.
Predator Attributes - Fortifies Strength and Speed. Fortifies Athletics, Acrobatics, and hand to hand.

Powers :

Vampiric Touch -  Available at all stages. Absorb health on touch. Grows in power with stage. 

Blood Cauldron - Sacrifice your stolen blood, advancing your vampire stage to restore health, magicka, and fatigue.

Stage 2 Replacement - Blood Frenzy  -  Sacrifice your vitality, Gaining a boost to physical stats for the duration, but damaging your health over time.

Vampire's Seduction - Powerful Charm and Calm ability. This calm is unique - it doesn't prevent dialogue and it isn't dispelled by attacking. Allows Feeding with vampiric touch.

Stage 3  Replacement - Mist Form - Transform into a cloud of mist, becoming invulnerable but unable to attack or cast spells. 

Embrace of Shadows - Long lasting invisibility. Removed the redundant night eye effect, otherwise unchanged.

Stage 4 Replacement - Call Bat Swarm  -  Call a swarm of bats around you, absorbing health from nearby enemies over time.


Vampire Ranks :
As a vampire, your powers will grow. Killing enemies with your Vampire Touch, Call Bat Swarm, or blood spells will advance your vampire rank progress.
After enough kills, you progress to the next vampire rank. Each rank comes with a passive bonus and gives you a new blood magic spell. 

These new spells deal blood damage, a new spell effect. Blood Damage is very cheap in magicka cost, but it also harms the caster. The health cost is based on the magnitude and modified by area and duration. Blood Damage is a fully functional damage type with resistances and weaknesses, and can be used in spellcrafting and enchanting. Resistance to blood damage spells can be bought from priest vendors in chapels. 

Vampire NPCs :
Vampire NPCs have also been improved. Every vampire NPC can now use the Vampiric Touch power. Some vampires can cast blood spells and use other powers.  Furthermore, Vampire NPCs have a higher minimum level - They are a more serious threat to a low level player. boss and unique named vampires especially are more dangerous. Boss vampires often come equipped with blood magic related items, as well.