Liches, vamps and other resistant undead
This is slightly incorrect, as liches have a +4 turn resistance, so, a cleric has to be level 30 (twice the HD) for a level 11 lich to be able to destroy it. (Turn resistance gives +4 to level agaist turning for all effects).
However I agree, Vampires should die, ghosts respawn and lich come back to try to kick your ass (well, try, as a lich level 11 against a 30th cleric has no chance..)
Seeing that to become a Lich the creature has to be at least a 11th level sorcerer, wizard, or cleric that would mean that the Cleric doing the destroying would have to be minimum of 22nd level.
This is slightly incorrect, as liches have a +4 turn resistance, so, a cleric has to be level 30 (twice the HD) for a level 11 lich to be able to destroy it. (Turn resistance gives +4 to level agaist turning for all effects).
However I agree, Vampires should die, ghosts respawn and lich come back to try to kick your ass (well, try, as a lich level 11 against a 30th cleric has no chance..)