I figure this would work good with any pally, but holy would probably be the best, considering the spell damage boost.
Anyway, requirements
-Paladin
-Level 20+
-Fast fingers
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Okay, what you do, is cast exorcism, and spam hand of reckoning while casting. If you do it right, both will hit at the same time, causing you to do lots of damage instantly(At my level, around 320, without crits). I'm level 22 fighting level 19 mobs atm for a quest, and I just figured this out. It works perfectly. I'm killing whelps almost instantly. If there's any problems, I can probably upload a video to youtube as proof. Enjoy pallies.
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Edit:
I meant PvE as in questing, farming.. etc. Not instances.. unless you're tanking of course.