You may use a death touch once per day. Your death touch is a supernatural ability that produces a death effect. You must succeed on a melee touch attack against a living creature (using the rules for touch spells). When you touch, roll 1d6 per cleric level you possess. If the total at least equals the creature’s current hit points, it dies (no save).
DESTRUCTION DOMAIN
Granted Power: You gain the smite power, the supernatural ability to make a single melee attack with a +4 bonus on attack rolls and a bonus on damage rolls equal to your cleric level (if you hit). You must declare the smite before making the attack. This ability is usable once per day.
Death Touch本身就是Melee Touch Attack了...也就是说配合破坏领域其实就是+4AB和等同于CLR等级的伤害而已...其它啥都没有......