Would probably have to be rad corruptor.
Heros
Max Powerz: Lv 50 Tanker
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Max Khaos: Lv 50
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Well Cold Domination has the higher percentages for De-Buffing and also has the nice +Recovery power for its tier 9 that would help you and your friend alot. You could sync the /Cold with something like Rad/ Ice/ Sonic/ Fire/ to help take down AV's. Although like MaxPowerz said, Rad is nice; traps of course for the nearly perma -Regen trap or Dark Miasma for its -Acc and -Regen. Its up to you! But numbers wise, Cold Domination gets the larger of all of them and i think the De-Buff (Sleet) can recharge very quickly, oh and did i mention you could buff your friend with Ice Shields and give him Frostwork so he can tank the AV and you can just DeBuff and Kill!
Laterz!
For What its Worth: Rad, Dark, Cold, Thermal, Sonic... in that order.
Kinetics has some single target debuffs but is the least debuffery of the lot.
Traps has some debuffs, including the mighty poison trap, but play is quite different. Hard to place.
Storm has some killer debuffs which come at a price: knockback chaos. I wouldnt know where to put it! 
/rad is great for turning GM's and AV's into kittens, /Dark is good for flooring their acc but don't think theres much def debuff in there unless your primary is rad blast.
If your MM friend is going the debuff route then maybe your could choose /sonic to stack res debuffs and also be able to buff up his pets so they are tougher.
sonic primary with /rad or /dark or /cold
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sonic primary with /rad or /dark or /cold
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This. If you don't like the sounds of sonic/ (I love 'em! 
) ice's slows work nice, too. Rad/ is situational, but quite useful once you start hitting high defense enemies.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
Alright, so overall the popular combo seems to be Sonic/Rad... Thanks all. I'll wait and see if I can get any more opinions/suggestions before making it... Considering I still need to think of a concept and appearance to go with the sets.
Sonic/Rad's gonna need some thinking to get the character to make sense...
I'd seriously consider dark -- Howling Twilight is an AV killer on its own. With only one toggle to keep on the AV compared to rad's three it can be a bit easier on the endurance in long fights too. HT is the big one though.
Dark Miasma doesnt do -Deff and the -Res comes from Tar Patch (which can be perma), not from Darkest Night; the -Acc + -Dmg toggle you are talking about. But! Dark Miasma does have very good -Regen and is better endurance wise than /Rad, also has a helpful pet too!
Concept wise a Sonic/Dark would be good (Dark Siren kinda thing), Sonic/Rad could be a robot or scientist thing xD, but meh whatever you want xP.
Alright, so now it's a toss-up between Sonic/Dark and Sonic/Rad...
Again, I've never actually played a buff/debuff AT past level 6 or so, so I'm going by what looks good on paper...
Both have AoE heals, Rad's doesn't require you to hit the enemy though so it can't 'fail'. However, Dark's gives -regen to the target (among other debuff effects) from what I've heard, so spamming it has two uses, topping up HP and keeping the AV/GM from regenerating.
Rad has Accelerate Metabolism, a nice little PBAoE buff for Recovery among other useful effects, such as making the MM's pets stronger.
Tar Patch appears to be very popular, even though I'm a bit mistrusting about targeted AoE debuff zone things that stuff can theoretically walk out of... But I'm assuming the slow effect is good enough to take care of that.
Rad has 3 debuff toggles, Dark has one. Dark seems easier on the endurance for this reason, whereas Rad's debuffs would be easier to keep up all the time. Not sure how well AM + Stamina would take care of Rad's end costs.
I'm not all too impressed with the looks of the last 5 powers in Dark Miasma. How useful are fears and holds on non-control oriented ATs against AVs and GMs? And how useful is the group stealth power when teamed with a Mastermind?
Both sets have a resurrect, though Dark's looks uncomfortable to use, if more powerful. But I plan to duo with this guy most of the time, so I don't really need an AoE resurrection... Why do you say Howling Twilight is an AV killer?
Also, does EM Pulse mean that Rad has better -regen in total when needed? When would you use it, anyway?
Howling Twilight does massive -regen and you can have it up every 45 seconds easily enough, plus for the rest of your career its a great PBAoE stun, really great. Think of it as a mass rez after all that. People who use it only as a rez are getting 5% of the use out of it.
The fear is excellent for mob to mob use at least, one of the best AoE controls in the game I think, plus you can easily stack it and most AVs are pretty easy to fear...
The hold is OK, pretty good when stacked with the pet.
Dark's heal is way better than Rads, and stacks -regen with HT, plus, you can use it from range which is good for the melee pets while keeping you safe from any PBAoE attacks the AV might have.
The slow is OK for AV fights, you won't slow them much but still, the -res is decent. You can slot decent procs in it too. Most AVs will stay in it when surrounded by pets.
Dark's pet is good. Its AI is better than most.
For sure, you can't go wrong with /rad, but dark is equally capable vs AVs and IMO better and more fun for the rest of the fights you'll have. Obviously that's just personal taste though.
When duoing AVs you'll always find some easier than others depending on their abilities.
Oh yes, the stealth, you can get some pretty decent team res out of that, particularly vs Psi and Fear which of course are really handy. Don't write it off for your duo.
Black Hole is the obligatory rubbish power in the set But then, rad has choking cloud which is probably only useful on a controller...
/rad actually has 2 toggles you gonna use against an AV. Not counting Choking Cloud with which you need to be dangerously close to AV's and get creamed quickly. Besides it's not that good a power imo anyway, especially not for a corrupter.
Many ppl tend to think /rad is the way to go against AV's and underrate /dark in that aspect.
I'm convinced that /dark is very good as well (personally i even prefer it over /rad). Massive -accu (which is really nice in keeping the MM pets alive), but not just from DN as said, but all powers combined. So also TG and the stare. The latter is not much use for fearing AV's as it's broken by the constand attacks, but the added -accu is very good (slot for -accu).
And then ofcourse you got Fluffy... with a huge accu (and dam) debuff PBAoE aura and her own personal DN on top of that. Take recall friend to be able to TP her right next to the AV, because that's where she comes to her own, not from range.
And then you also got all the combined dam debuffs from TG, DN and Fluffy. Lovely.
Also the nrg and psi resist from shadowfall (apart from the nice stealth ofcourse) is very sweet against AV's and carnies and arachnos you will face a lot in the late game. The +def is rather small and not worth enhancing imho, but offers a nice small synergy with all your accu debuffs.
I reckon Pwipski is saying HT is good against AV's because of the nice -regen and -rech, but LR from /rad is overall better then HT. Except against AV's with high def, cos HT is auto hit and LR is not. But most of times this shouldn't be a real problem. (and also you got your /poison friend MM with nice def debuff).
Both are very good against AV's, and imo you should just take the secondary you prefer most overall. AV's will make out relatively few mishes considering your whole career as a villain. So pick the set you think you'll enjoy most from 1-50.
Either set has some slight advantages against some different AV's, but in the end it comes down to what set you like to play.
Have fun! 
Actually if you use Achilles Heel chance for res debuff in rad attacks you can debuff both defence and res. And the res debuff is much longer lasting than sonic attacks, ideal for AVs and the like.
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Actually if you use Achilles Heel chance for res debuff in rad attacks you can debuff both defence and res. And the res debuff is much longer lasting than sonic attacks, ideal for AVs and the like.
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But it only crops up 20% of the time remember, so realistically its only worth it if the debuff lasts 5 times longer than the equivelent Sonic attack (and is also worth a slot plus however much inf they cost a pop).
Out of interest how long is the debuff? I have it in Acid Mortar myself but amn't sure how long it sticks about.
My Dark/Sonics defender is great vs AVs and for my money Dark is more fun to play than Rad. A Sonic/Dark Corrupter would be a lot of fun (and you can the -regen & -resist combo of Twilight Grasp + Howling Twilight + Tar Patch earlier than the Lingering Rad + Enervating Field combo).
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..and her own personal DN on top of that.
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Finally someone else noticed that. I've mentioned it before but people assume I'm on about the Chill of the Night Aura Fluffy has. She can sometimes un-DN if distracted or not re-apply another DN right after defeating an enemy, but with AVs it is usually a much longer fight.
I personally love Miasma for this sort of thing, it's great to fight AV/Heros and not get hit due to the combined efforts of Fluffy, DN and Fearsome Stare (both are just about equal in debuff %).
Never really seen myself comparing the heals between Rad and Miasma, Grasp heals bigger, for the same price and adds debuffs, Rad is autohit so you're not worried about missing, but it costs a lot for what feels like so little.
Rad is a dander of Debuffing all around though in toggle format.
Given the similar debuffs and different ways of applying, it is all down to what you prefer? Making enemies neon green and sterile or blinding the [censored] out of them with a blanket of darkness.
@Drakmarth & @Drakmarth2
Avatar by S. Wall
#415877 - An Uncivil War: Preclude - Looking for Feedback Went with Rad/Rad, named Half-Life. Thanks for all the advice and helpful information, people. It was a real tough choice between Dark and Rad even with your help, though. :P
Cold domination is really the best secondary against AVs for me:
- You don't have any toogle (you can be mezz debuffs are not falling).
- it's debuffing secondary powers (with benumb)
- -regen more or less the same than rad or dark
- better -res, -def, -dmg, -rech debuff
- end drain who give also +recovery
- good res against fire, cold, energy and slow (with the ghost widow epic shield you can boost also easily smashing, lethal, energy negative and toxic)
only miss 2 things : heal and -acc debuff, you can take medicine for the first one (not as good as a PBAoE heal but quite usefull)
For the primary, rad and sonic are the best choice : neutrino bolt is one of the best dps of corruptors and -def is always good, the -res of sonic is really nice. Depends of your slotting.
while agreeing 100% w/Pwipski on the darkie front, i'm surprised /Cold was missed out altogether until Melian's post.
It's all summed up there, but I'll second simply how filthy it is, in terms of an AV eatin' machine
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Sonic/Rad's gonna need some thinking to get the character to make sense...
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I know the thread is kinda done but a concept for this would be some sort of wave emitter, a master of all types of wave emission (except water* ), i.e. Electromagnetic (including Gamma Radiation waves) and sound (tro sonix ye)
EDIT: *Oh and Mexican, although with a certain cossie this perhaps could be incorperated 
@Rooks
"You should come inside the box... Then you'll know what I mean."
ive recently made an AR/Dark corruptor...he is lvl 13 atm...
will it be possible to solo AVs?
i know AR is not the best set, but iam tired of fire and ice corruptors...and i already got a a sonic blaster..(and dislike the other sets).
BANG BANG!!!
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ive recently made an AR/Dark corruptor...he is lvl 13 atm...
will it be possible to solo AVs?
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Somehow I don't see that happening... like... at all.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
everything is possible just a matter on how much you are willing to sacrifice to perform the task
for example?
BANG BANG!!!
Hi there, all you wise people of the Corruptor sub-forum.
To keep a long story short, My friend has a Necromancy/Poisons Mastermind. He asked me if I'd be willing to make a new character to duo with him, both for company and to help him take down AVs and the like. I figured the best partner for him would be a Corruptor.
As /Poisons is really heavy on single-target debuffs - I've heard it's often thought of as the best secondary for AV killing - I figured I'd go for a similar idea on my Corruptor to maximise the amount of crippling done to any unfortunate Hero caught in our evil grasp.
So, after eyeing all the Corruptor secondaries... I came to the conclusion that to the untrained eye they all look vaguely similar in mechanics, though different in terms of thematics. As I've never played a Corruptor past level 6, I'd like to ask for advice.
Which Corruptor secondary (and primary?) would be the best for single-target debuffs or synergize the best with Necro/Poisons?
I'm assuming it's not going to be /Storm...