if you looking powerful necromancer follower this mod for you

Zolomon Dust is a powerful necromancer he is a better skill other mage in skyrim
you can find him in sleeping giant inn


Zolomon Dust Powers and abilities
Main Spell : Lightning Bolt
Power : Clone 1

Clone 1 : Zolomon Dust Clone  Power and abilities
Main Spell : Ice Spike  
Power : Clone 2

Clone 2 : Fire Mage Warrior Power and abilities
Main Spell : Fire Bolt
Main Weapons : Fire Daedric Sword

Zolomon Dust VS Ebony Warrior