According to the Corruptor numbers in the recent free Prima guide I7 update, the values of -regen are 50% for all three powers ( -90% in PvP ).
Both Transfusion and Twilight Grasp have durations of 20-30 seconds and short recharge so they are easily stackable.
Lingering Radiation I think has a longer duration of 45 seconds, but has a recharge of 90 so is stackable only with AM and Hasten. So in theory Lingering Radiation is the worse of the 3.
However from reading the forums people haven't noticed the addition of a Kin or Dark improves AV takedown quite as noticably as the addition of a Rad so I assume that either the regen numbers above are wrong or Lingering radiation is the only one that stacks. Either way something fishy is going on.
PS I don't think this has anything to do with the other buffs /debuffs because they all are about the same. Kin is recharge and +dam buff heaven, Dark has the best -res, Rad has -res and has some buffs that are significant but not as good as Kins.
@Unthing ... Mostly on Union.
I heard you'd copied me and gone for a dark/rad defender False. 
Rad does seem best at -regen although it shouldn't be. Dark isn't so bad though. Just make sure Fluffy is out all the time, put TG on auto, use tar patch everytime it's up (double stacks nicely for a 60% -res for 6 or so seconds if using hasten) and definitely use Howling Twilight as soon as it's recharged (it seems to have a big -regen). The only time I ever seem to see myself affecting regen is just after I've used HT.
Humpf I didn't copy you 
I thought u were Rad/Dark :P Ehehe. Hows it going mate? 
Btw Faulty what powers from Rad did you pick? So far I only have Neutrino. Probably I'll get Irradiate, Cosmic Burst, Neutron Bomb.. and who knows Atomic Blast for teh fun. 
Thanks for the feedback
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
Not doing bad thanks mate.
I've had most of the powers from Rad so far and changed them around a few times. Originally I was intending to do a lot of defence debuffing and Irradiate is good for that. Found it wasn't so useful once people start slotting acc SO though and Dark isn't quite so safe for jumping into the middle of a group. 
As I don't solo and this is a staminaless build I don't attack much nowadays. Have Proton Volley for picking off the odd straggler (and it has a great sound Star Trek sound). Have Neutron bomb for the occasional AoE debuff (and it looks good). Also have Atomic Blast as it has a great BI and I'm trying to perfect a risk free nuke involving double stacked tar patch, power buildup, fluffy and a few other things.
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Both Transfusion and Twilight Grasp have durations of 20-30 seconds and short recharge so they are easily stackable.
Lingering Radiation I think has a longer duration of 45 seconds, but has a recharge of 90 so is stackable only with AM and Hasten. So in theory Lingering Radiation is the worse of the 3.
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Yeah, but people who have lingering rad are most likely to have AM themselves as well..
And not long ago there were lot of discussion about the -regen figures of lingering rad, as it seemed to have a better effect than the others.. I wonder has anyone come up with any hard data?
There was a post on the US boards about testing regen but they were struggling to even come up with a solid formula for how it works let alone test the powers.
I've just tested Transfusion, Twilight Grasp and Howling Twilight on Kraken (Giant Monster). With my Troller L50 transfusion was not a help at all. Kraken's life was 100% all the time. Then I changed to my lowbie Dark defender and tried TG on him. No effect at all or minimal. HT is the only power from Dark that seems to debuff *A LOT* his regeneration. However the recharge is still long on my toon. Then one Rad troller appeared and made me feel bad and useless with his bloody lingering radiation. But at least we took the git down eheh
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
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I've just tested Transfusion, Twilight Grasp and Howling Twilight on Kraken (Giant Monster). With my Troller L50 transfusion was not a help at all. Kraken's life was 100% all the time. Then I changed to my lowbie Dark defender and tried TG on him. No effect at all or minimal. HT is the only power from Dark that seems to debuff *A LOT* his regeneration. However the recharge is still long on my toon. Then one Rad troller appeared and made me feel bad and useless with his bloody lingering radiation. But at least we took the git down eheh
[/ QUOTE ]did you continue using twilight grasp when he used LR? If you did, the powers could as well be both as effective, since they were stacked.
Twilight Grasp and Transfusion are terrible -regen powers. For those of you who have been hit by one in PvP, you'll know that you get "immobilized" for a very short amount of time after you're hit by one. The -regen debuff only applies while this immob is in effect in PvP and PvE. Only "lasting" -regen debuffs such as Lingering Radiation and Howling Twilight are any good.
I didn't. Just debuffed Karken with Tar Patch and Darkest Night then attacked him. I guess Howling Twilight can exceed LR or at least debuff equaly. Slotting HT with 3RechRed SO's + Hasten should make it perma or fast enough to keep -reg on.
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
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Twilight Grasp and Transfusion are terrible -regen powers. For those of you who have been hit by one in PvP, you'll know that you get "immobilized" for a very short amount of time after you're hit by one. The -regen debuff only applies while this immob is in effect in PvP and PvE. Only "lasting" -regen debuffs such as Lingering Radiation and Howling Twilight are any good.
[/ QUOTE ]Wrong actually, at least for twilight grasp, the -regen lasts quite a while. Besides, the immob of those powers was removed in a patch a while back to prevent containment when using those powers, AFAIK.
Hmm, certainly Transfusion had a very noticable effect on Neuron when the team I joined had been plugging away at him for about 25 minutes. Soon as I got a couple of siphon speed's stacked the transfusion really started to have an effect. So much so that he went down within about 3 minutes of me getting there.
Defiant 50's
Many and varied!
@Miss Chief
From my experiences with my dark/dark corrupter I would say that dark on its own doesn't help a great deal with regen - you get hit a lot less and the AV/Hero can be held about 50% of the time (stopping active recovery powers), however when teamed with either a rad or a kin as well the AV drops much faster with far less damage incoming, indead Dark corrupter/ Kinetic and a poison MM combo was one of the fastest teams I have been on to take them down - now obviously poison MM is not available to help defenders (unless your doing Snaptooth) but traps should go some way towards this.
The impression I get is the debuffs from dark stack and Kin is very good at enabling this to happen, however rad debuffs seem to replace existing ones rather than stack with them.
In general I feel that if you only have a single defender/corrupter available then rad is superior but when more are available a combo including a kin seems to work better (this may be as much to do with the increased damage and higher attack rate beating the regen)
It would however be nice to see a full comparison of the effect on regen from all the different powersets with a - regen capability and not just rad/kin/dark so certainly include poison/traps/psi and I'm sure there are others, also how do they compare between ATs with the same powerset.
Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant
Did a couple of AVs tonight villain side - Valkerie and Luminary. A dark/dark corr, a fire/dark corr, em/regen stalker, nin/nin stalker, and me on my energy/energy brute.
Happily took them down with the corrs spamming TG, and HT when it was up. The health bar was steadily moving with the stacked TGs (from two fluffies as well), but made it's biggeest dents when HT was used.
No idea on how to test the numbers though.
Ok, I did some limited testing. Picked a +1 Lt for my testing. This was pretty rough.
Normal regen = ticked at ~25 seconds
Spammed TG (should 3 stack it) = 7 mins and no regen before I got bored
Attempting to hit TG once every 20 seconds (its duration) = ~46 seconds for a tick
Like I said this was very rough but it would suggest that -regen is a straight subtraction from the base regen rate? Triple stacked would be about 100%-135% regen which equals zero (capped) assuming most mobs have 100% base value. One application of TG would be about 100%-45%=55% which would be just under double the time of normal regen ticks, which is what it seems to be.
Doesn't help with finding which power is better but I only have dark to play with.
Hio guys. Since the release of i7 Radiation defenders/trollers are now the most wanted in a team (especially to fight AVs). I've just been wondering wich is the difference of -reg between Lingering Radiation, Transfusion and Twilight Grasp. Personally I prefer Dark Miasma (and I'm currently running a Dark/Rad) but it seems most people don't really recognize the value of a Dark defender on a team. I can't say it is the most powerful but it surely is uber
Well then.. the topic is now officially open for (friendly) discussion. Peace.
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]