This very simple mod removes the level limit when raising undead. The difference between the different levels will be simply the duration of the reanimated corpse, which will last longer at higher levels.
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Do you also think necromancy is underwhelming and hate those "this enemy is too powerful for reanimation" messages whenever you try to reanimate something? Not anymore, since this simple mod will remove the level limit. Now you can raise anything you kill or any corpse you find, since the very beggining with raise zombie. The more powerful variations will just last for longer (raise zombie lasts 1 minute, and you get 1 extra minute per level, until dead thrall that will give you a permanent minion).
I don't think this should be overpowered, since the enemies you encounter are usually on pair with your own level (another reason why you can't reanimate most kills in the vanilla game).
The mod is tagged as an ESL, so it won't count towards your plugin limit.
INSTALLATION
Op1: Use mod manager option and install it with your mod manager (vortex or mod organizer, I use mod organizer) Op 2: Paste the content of the 7zip in game's data directory in the game's installation folder.