Yup, Adam beat me to it. We wanted something that showed a special relationship between the undead and the divine power of the cleric.
Speaking of which, I played a Cleric in an undead-heavy dungeon last night, and it worked great! Turn Undead was actually a decisive factor in one battle as it less us corner two wraiths so the fighter could get a good shot at them. And it saved the Bard's life! (Okay, maybe saved is a bit strong, but I totally get credit for the assist.)