Removing the kill after a minute effect was a great move, but I have a hard time justifying it when I can just resurrect them more often and without complaints. Most people don't want to be undead. With the advent of the Neg Energy Warlock and the Apothecary throwing harm admixtures, as well as the updated Paleamater, it is a good time to be undead. If you reduce the cooldown to 2 minutes and allow us to make an ally (with their permission like a raise would get) undead and able to be healed with neg energy, basically just gaining the ability to give another a shroud (maybe basic form of current shroud). It would be a great alternative party healing arrangement and open up neg energy healing a little bit.
Also, please allow negative energy to pierce through all forms of immunity rather than just undead. Iron Golems are the worst as a palemaster and all the lower constructs do get neg energy. Plus there are some plants that get healed off of it. No other caster with similar immunity stripping abilities have holes in what it applies to. Possibly should also strip the neg energy immunity (not the instakill block) from the Death Ward Spell, but I am ok with that staying as is.