Ok this is my Witch Doctors who spam acid cloud to trigger life on hit, chance on freeze/stun and do wide spread AOE damage.



Their DPS was likely no more than 15k at the time, which meant 'slowly but surely'. They did have about 300 res, iirc, along with about 1000 life on hit should allow you to heal through the flames.

I have since gotten the achievement for killing under 2 minutes, but I haven't timed my fastest kill.