Necromage

 is a perk in the Restoration skilltree which causes all spells to be more effective against undead. It requires a minimum of 70 points in the Restoration skilltree and the Regeneration perk.

Vampire usage
If the player character is a vampire as he takes the Necromage perk anything that acts as a spell cast on the player will be more effective. These include
 * Enchantments with variables
 * Potions
 * Certain Perks
 * Standing Stone's with variables
 * Flesh Spells
 * Conjuration Summons will last longer.

Note that perks must be taken AFTER the player activates the necromage perk as a vampire and this also works with the Vampire Lord.

Totenmagier