If you've got 3-6 friends or supergroup members in-game that play consistently, and at around the same time as you, then you all may find it fun to try working together using corruptors centered around Radiation Emission.
Why a team focused around Radiation Emission? Because, if done right, you'll be virtually invulnerable and blow through +3 Relentless missions with speed and ease.
Why 3-6 people? Because 3 is needed before you start getting the most out of stacking your /rad debuffs. You can duo two /rad players, sure, it just won't be the same teaming powerhouse that you get with around 3-6 /rad players.
Why stop at 6? Well, you don't have to. 8 people won't hurt. It's just that you only need around 4-6 to really be effective.
The core classes of the team should be:
Rad/Rad
Ice/Rad
Sonic/Rad
Dark/Rad
Additional classes:
AR/Rad
Fire/Rad
The primaries:
Rad decreases defense, Ice decreases speed, Sonic decreases resistance, and Dark decreases accuracy. Together it's a cocktail of destruction on top of your /rad debuffs.
AR and Fire are not part of the core set because they don't contribute to debuffing with their attacks, but they can still contribute a lot with their nice damage and AOE attacks.
Energy is really not preferred. It has poor AOE, and all that knockback can be counterproductive to this group style.
The Secondaries:
It goes without saying that the purpose of having so many /rad secondaries is to spam your AOE debuffs (which stack with each other) to the point where mobs can't fight back and go down fast.
You've also got a decent heal to keep everyone in good order.
Power Pools:
-Get Hasten. It will suit the high speed nature of this group and you'll want Accelerated Metabolism up as much as possible.
-Stamina is a no brainer; BUT, it's possible to do without it if you've got so many guys spamming Accelerated Metabolism for the endurance reduction. The only reason I say you need it is because if you want to get the Leadership pool you're probably going to need it to adjust to the increased endurance drain.
-Everyone gets a full Leadership pool, except for Vengence. Why? Because they STACK! You've got 6 guys giving each other a combined bonus of 16.5 Defense, 90% Damage, and 60% Accuracy!!!
-If you find yourself low on room for power choices (which you might, considering all of the power pools you already have), just get superspeed as your group travel power.
-While you might consider the Leaping pool something to consider for it's status protection against immobilization, hold, and knockback (in addition to it being a superior travel power to superspeed), the fact is you probably won't be able to afford another 3 power pools with this build. And really you shouldn't need to worry about getting knockbacked or held when you've already debuffed the enemies so bad that they can't even hit you.
-Stealth is not necessary. Your job is to kill everything in your path instantly, not ghost missions.
Notes on power selection:
-Focus on your AOE attacks as the main means of taking down mobs. Individually they may not be much, but together you'll mow down mob groups by the dozen.
-Keep in mind that once the epics and level 50 come in you may or may not want to have a couple power slots free to get a useful epic power.
-Linger Radiation may or may not be required. Under most circumstances it may be overkill to use on top of your stacked toggles. But I'm sure you'll find it a welcome addition when fighting Heros or Giant Monsters.
Powers you can sacrifice:
-Fallout
-EM Pulse: Your debuffs should keep the enemies in such a useless state that an AOE hold is just overkill.
-Choking cloud: Same as EM Pulse.
-Mutation. Just have everyone keep at least one awaken on hand.
-Snipes aren't needed at all.
-Aim isn't needed when you're debuffing stuff so severely that you can't miss, and you'll be doing incredible damage without it anyway.
-Technically you could sacrifice your nukes because you shouldn't need them if you're playing right, but nukes are fun! So do what you want with regards to them.
-What to sacrifice in terms of attacks from the primary pool varies by what power set you have; but if need be there are usually one or two single target attacks you can get rid of in favor of focusing on your AOE attacks.
Notes on slotting:
-Slot your AOEs for the highest damage and fully increase their secondary effects (like acc debuff, def debuff, res debuff, slow debuff, etc)
-Fully slot your /Rad debuffs for maximum effect. You may need to throw in an endurance reduction on some.
-No need for accuracy slots; You've got a ton of accuracy from everyone's Leadership pool!
-Maybe slot your Radiant Aura with 3 Heal, 1-2 Recharge Reduction, and possibly 1 endurance reduction. You may not need to slot it at all if the group works well together, but I believe in a setup like this it would prudent to have superior and rapid healing available in a pinch. If you have the slots to spare go for it, if not you can sacrifice some slots (or all of them) from your heal.