I've been able to get my GF into dual-boxing, well tri-boxing but thats symantics. She is running a Pally and 2 x Warlocks. Her current attack plan is DOT DOT x 2 - Fear x 2. Pally tanks mob. Shadowbolt x 2, Imp x 2. Its a sight to behold. I can only image the power of 3-5 warlocks.

Headshot indeed. inch: