I echo the sentiment that it should be a spontaneous caster, along the lines of the Beguiler or Dread Necromancer.

Also, it could really use a capstone. Right now, the closest thing it has is the ability to prevent people from being resurrected. It can be useful in the right situations, sure, but when your entire class is focused around a single function, and you've stuck with it for twenty levels, I feel like you deserve Regeneration, or the ability to cast True Resurrection for free, or something.