EDIT: What template are you thinking of, specifically? Undead HD is a d8, from everything I've seen yet. Also, zombie template would make my int and cha go down to 10. >_<
Originally Posted by shadowhntr7
Heh, sorry. I was thinking 3.5. I forgot Pathfinder intentionally nerfed the undead specifically because so many casting classes WERE taking templates. All the same, d8's are okay, and adding your CHA to your HD is bloody useful in your case. +5 HP per level, making you as sturdy as a Fighter/Ranger/Paladin with CON 16.
Still, if I had my pick, I'd say Wight. I've only got the SRD to go off, no Bestiary books available to me at the moment, but they're CR+1. Which (technically) isn't going to translate to a huge LA (I think. I just realized I don't normally calculate LA's and such, so have next to no idea if I have this right). At the same time, you get those tasty CHA based HP, and a Wight has a +4 to CHA. It's a lot of gain, but it will come at a very steep price; beyond the usual undead tomfoolery, you'll be unresurrectable. If you're destroyed, trying to resurrect you will just destroy you again. You'd need to be reincarnated, and since you're a sin against nature as is, finding a druid who wants to do it will be pretty well impossible.
They DO gain a +2 to all other stats save for CON, naturally, but overall I actually wouldn't call this whole thing overpowered. It'd probably be LA+2, and the slow down of spell casting advancement will negate the more potent spell effects and the extra bonus spells. You'd gain d8+7 HP per level, though, so you'd be pretty amazingly tough. It'd make a great "Dread Lord" necromancer, raising fewer of the dead but marching with them, using spell like Righteous Might, Bull's Strength and Enlarge to make up for the lower BAB (Or just dishing out touch attacks whilst your undead give you flanking). Still, actually hitting people as Wight has advantages. Level drain, and all that.
Edit: ...Well, now I REALLY want to use a Wight necromancer as a BBEG in another game. :P