I think it would be neat if necros got a "Zombie" spell which could effectively give a creature or PC "undead" status.
In my vision, undead status would include:
-Unable to be healed, empaths and herbs cause damage
-Blessed weapons do higher damage
-Undead type crits
-Higher vitality, greater strength
-Clerics able to cure status with uncurse

I suppose it would be similar to the idea of the Necro 100th ability to turn themselves undead, only temporary. I suppose it could be useful for both clerics and empaths in fighting monsters, plus it would just make the game more interesting to turn people into zombies then kill them with blessed weapons.