Two Fire/Rads would be the easiest. Both running Hot Feet + Choking Cloud, popping AM whenever it is up. The follow character could even be spamming the AoE Heal.
Stacked Choking Cloud means most of the foes will be held in a few seconds. Hot Feet to chip away at their health. 6 Fire Imps to wipe out the foes.
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Guide Links: Earth/Rad Guide, Illusion/Rad Guide, Electric Control
In the olden days, before IOs and incarnates, I used to 2-box farm with a fire/kin and a fire/sonic. That combo works very well together. The Kin can let the /sonic use all his toggles and the Sonic provides mez protection and allows a staggering amount of damage to be done, with FS * Disruption. 2x Hot Feet and 6 Fire Imps creates a lot of damage while you do other things.
IMO, Earth isn't great for a 2nd box unless you can actively play it. Location based powers are a pain, as they require 2 steps. Fire/Sonic can contribute quite a bit by merely buffing every 4 minutes.
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I was curious of opinions on dual boxing controller duos, I started dual boxing on one machine a month ago and have played a few combos, mostly a brute or scrapper +defender. As it's one machine I mainly play one character and have the second on auto+follow.
Recently I had alot of fun with two cold/sonic defenders stacking leadership, and artic fog. My plan was to do the same this time with sonic stacking sonic dispersion and having disruption field on each other, having to be in melee for the fields debuff and having only cone aoes wasn't as enjoyable as I would have liked. I was thinking of redoing those two as earth/sonic, using the animate stone pet to anchor the disruption field. seems there would be better choices for a second controller, earth/therm, +res, +damage and heals, emp or a debuff set, no idea where to go with the second controller, seems a second sonic is over kill and not sure if earth should be changed as well.
Eath/sonic + ??(earth/therm, plant/ss, earth/storm, earth/kin, earth/emp, anything else)
Any ideas or opinions?