Those who serve you truly give their all.
Exanimate Expert
prerequisite: wizard, necromancy school
Life is a toy in your hands. Gain the following benefits:
- You can perform grim harvest on constructs and the undead.
- Double your class level and proficiency for any undead under your undead thralls class ability.
Thoughts?
Throat Punch Games 
I like part 1. Doubling undead thralls’ ability is a bit over the top, IMO. Perhaps replace with something freaky like granting undead +5 or +10 to their movement speed. Call it undead celerity. There’s nothing scarier than fast zombies, skellies, wights, wraiths etc.