#1 Debuffer? #1 Buffer?

Makes sense, and yes it was the stormy (Aspect of Rularuu). Hey, I didn't form the team And of course I agree that less melee/more debuffs were needed. Nice to see the numbers though, wasn't aware how high it was. And of course you have to take the shield into account too and the time he regens back, but that's not too big of a deal. I think he dropped in 2-3 rounds in previous runs.

MT

I agree to a certain point. Cold and Storm with snowstorm and sleet/freezing rain can make a noticeable effect on -recharge, modest to be sure. However, Kinetics has siphon speed, and due to the mechanics, the -recharge/slow is IRRESISTIBLE. The contribution of transference and speed boost to keep a team/league juiced up with endurance should not be underrated.

Cold and Storm really rock the -defense and -resistance along with slow. Radiation has really good -regen between lingering radiation and EM Pulse. If you are looking at debuffs only, a high level Trick Arrow is very capable of debuffing AVs. EM Pulse Arrow has the -1000% regen, but no comparable power to lingering radiation.

Against foes that do heavy psychic damage, Dark is what you want for the resistance to psychic damage from the very large Shadow Fall PbAoE. The only AT that can compare to dark's psy resistance is the soldier of arachnos. A single cold defender can buff and debuff a team to success, but a team of 8 soldiers of Arachnos is a mighty mighty force.

For hard targets specifically, I'd say Cold is the best debuffer while Kin is probably the best buffer. If you're looking to be the ultimate team player, then I think you have the right idea with a cold/sonic def. If all you want to reduce a mob's regen though, just break out the Longbow pets.

Though Benumb would reduce the -tohit effect of the Hurricane, helping the melees hit better. It also handles other problematic AV powers thanks to the -Heal on it, such as Ghost Widows melee heal on the STF, the Healing Nictus on the ITF, and so on. The -mezz on it reduces the magnitude of AV mezzes, such as Scirrocco's huge Hold and the Stun from Reichsman. And Cold on a Defender would let you keep -30% Res on the AV from Sleet alone, with bursts to -60% from Heat Loss. Add /Sonic and you are routinely at -100% resist, with bursts over -150%, since the sonic attacks stack -resist. All together it would be like having ANOTHER whole league of your melees with you, damage-wise, which might have been enough.

Cold/Sonic is brutal enough on AVs that I have to be kind of careful on BAFs to rotate between the two final AVs to keep one from dropping before the other. You do need to be willing to invest in a IOed out high recharge build, though, as Benumb and Heat Loss are on long timers. If you want to do it on SOs, Rad/Sonic is much easier.

It's really easy to stack sleet's effects too. The sleet storm lasts 30 seconds and the effect lingers for 15 seconds after it ends. At maximum recharge you could almost triple stack it.