I have a been trying to solo farm Iskatu for experience to get my levels up to a point where playing Hell is less "squishy". For some reason I am not finding the right build for the Witch Doctor to make killing him alone on Nightmare with the templar effective.
I have been using this build which is nice in doing passive damage but is not effective on the higher levels.
http://us.battle.net/d3/en/calculator/witch-doctor#aZUdjT!ZVW!aYZaYZ
What is the most effective build for killing this boss that places an emphasis on speed to complete specifically for the Witch Doctor? How does this build change when you fight him on Hell vs Nightmare.
Best Answer
In my experience as a witch doctor it is best to aoe away all the small shadow demons and "slowly" chip away at Iskatus health in the process. I made you a new skilltree:
http://us.battle.net/d3/en/calculator/witch-doctor#hSUdiP!ZVW!aaaZaa
Here is the reasoning behind the spells:
If you are level 60 and you fight him in hell I would change the Locust Swarm with Zombie Charger (Zombie Bears). As well as the Acid Cloud to Mass Confusion (Mass Halluzination). Also the Jungle Fortitude passive becomes a Vision Quest. This setup allows you to keep 4 spells on cooldown at all times, thus giving you huge amounts of mana to summon these high burst damage AOE bears every few seconds. This allows you to clear out the area around you at all times and when Iskatu gets close to you he is toast.
If your equipment isn't that great yet or has mainly offensive stats I would keep Jungle Fortitude and give away Pierce the Veil instead, especially since this gives you even more mana for bears.