way of the wicked - undead templates suggestiopns

[Melvin the Mediocre]

I am starting a way of the wicked game in about 3 weeks. The cleric is going to be an unhholy barrister which means that he can use his channels to heal, but if anyone who accepted that healing dies with in the next few minutes, their soul is bound to Asmodeus.

If that happens, I thought it would be cool for Asmodeus to send them back as an undead. I'm looking for suggestions that won't be overpowering at low levels, but will still give a neato factor at higher levels. Any thoughts?