Dread Necromancer is a class who can rebuke undead. When they attain 20th level, they become a lich.
My players have just encountered one like this. One of the players was a cleric. It was obvious he would try to use turn undead on the lich. I am not sure if I've made a mistake, but I allowed the lich to bolster himself.
I am aware that evil undead clerics can bolster themselves, but I am not sure how it works with other classes with rebuke undead ability. Can they do it?