Well, if you have Math Skill as a side job ability, CT, 4, and 5 learned on calculator, death learned from Wizard, and an item that prevents instant death, and high faith, you can take out a ton of people really quickly at the start of the battle. (You need to see which of CT 4 or CT 5 will hit everyone.)

If you've never noticed, CT 4 or 5 used near the beginning of a battle will target every character on the field. I forgot why, but yeah. CT 4/5 and Holy works well too if you have Excalibur. Yeah. Calculator pretty much dominates everything. :D