Kin is hands town the top of the list. Kins cap the entire teams damage, bug meet hammer.
Then Cold Dom with it's fulcrum like -res, but cold dom needs a high end high recharge build.
Sonic/Sonic it's hard to get more -res.
Sonic Blast/Rad - Traditional top performers.
Fire Blast/Rad - Traditional top performers.
Dark has a larger radius, but it's -res is a bit more annoying to maintain and stack.
Fire/Traps if you want to solo and help the team both. You get a good dose of everything, but you also have to learn to adapt to how fast the team is moving.
Kin-Will increase anything due to the added recharge and damage cap...can be decent for solo EB and AV fights since the -regen isn't bad and the buffs are sexy.
Cold-Adds insane amount of -Res Thanks to Sleet and Heat Loss. Can turn Bosses into kittens....seriously cold is made to just destroy AV's and EBs. Superb debuffs and buffs...ugh yes.
Poison-Well lol. Better for large mobs of minions and lts but it can dish out a lot of -res much like cold and Poison Trap is powerful.
Traps-FFG is a Team buff and it's loved. ...ugh I can't type everything lol.
I would go with Traps since it's good at everything. Second I would say go with Cold. Third Dark...Howling Twilight has a lot of -Regen. Fourth Poison. Fifth Kin.
Storm is really up there as well but if you don't like Knockback then it's not the set for you. Storm is great at killing bosses and AVs and it's gets darn right fun when you have two hurricanes out at the same time...it's like a mini nuke lol.
Traps has some of the best -res in the game if you have high recharge. Having multiple acid mortars out will stack. Also the poision gas trap has very good -regen. As someone else pointed out it has the force field generator as a team buff, and since it's a pet it won't suppress if you get mezzed. The set has no +dmg or +rech however so it only meets 2 of the things you're looking for.
What's the best secondary for increasing boss kill speed on a teamplay Corruptor? Yeah, yeah, I know, Defenders have better modifiers... and decent damage when soloing anyway... wait, why am I wanting to play a Corruptor, again? ...okay, regardless:
I'm thinking specifically of four factors : +DMG, +RECH, -RES, and -REGEN. And of course it's important that these things -- particularly the -REGEN -- can be kept up constantly. +Recovery wouldn't hurt either. I wouldn't mind something I don't have to spend an insane amount on; this isn't going to be one of my high-investment characters, more something to fill a niche when needed.
Time, of course, does all of these things, because Time does everything why not. However, the numbers are a little on the low side for what I want (and i'm not sure if the -regen can stack). What other options do I have? I'm a little unclear on which effects do and do not stack, and of course the in-game tooltips don't show the effect numbers on summonables, nor always whether or not powers have stack limitations.
My list thus far:
Cold Dom : Struck out. The recharge times on its best powers are just too slow.
Dark : Looks solid, but how's the stacking on -regen from Twilight Grasp?
Kin : Great set, but no -res.
Pain : ...
Poison : Strongly considering if only because I've never played it before. Offensively fantastic; no relevant team buffs, though. How's the stacking on Envenom?
Rad : Basically perfect. I've played a few Rads already, though, so I wouldn't mind trying something else.
Sonic : Soft spot for this set but doesn't really do what I want.
Storm : Why is this on non trollers, again?
Thermal : CDs are a little longish, but I *could* swing it.
Traps : It's all pets! I literally have no idea how good these powers are because I've never used it. Plus, no team buffs.
TA : This is, what, a PvP set or something? -1k% regen for 15 seconds?