this is my build as of act 3 nightmare and i am really not having any trouble with anything no matter how much i kite to a goup i use direbats for the crits and mass burst damage the skulls when i run low towds the end of the fight to finish off stuff and my spirit walk for the mana and escape oh and my big bad voodoo for the damage duh but I have a feeling i will be changing as things get harder into hell.
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http://us.battle.net/d3/en/calculator/witch-doctor#hcTUPQ!bZV!ZabZab