you might want to have a look at Simak's Tankermind builds as a basic template here (they helped me quite a lot, when redoing my build).
As I learnt from testing these builds, its all down to getting the most out of defence/resitance buffs/bonuses, & letting your bots do all the damage, while you do the crowd control + healing/debuffing. I would highly recomment trying them out if you have the inf + respecs to do it.
For reference, here is my current setup:
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It's not fully complete yet (cost quite a bit more that 250m tbh too), and I've not tried soloing any AV/GM on it yet, but running 0x8 baby mishes is a walk in the park 
http://www.scene-and-heard.com/cov/covsig.jpg
Hoo boy.
I'll address problems and make suggestions as I go down your build
1) More slotting for TWG. If nothing else, take the end reductions out of your upgrades to give it five slots. It has to hit, remember? Give it more accuracy.
2) Dark Watcher's Despair is generally pretty cheap to pick up. Get it, love the recharge bonus, slot it in DN
3) Your battle drones should have a resistance or defense aura in them, they don't need that blood mandage acc/end.
4) Your prot bots DO need their slotting, 4 slot pet damage IOs and two defense IOs
5) Your assbot has enough room for a pet unique plus the soul bound proc plus 4 pet damage frankenslots as well. I've got both pet uniques possible in every bots build. Especially with dark, where that extra defense and resistance goes a long way.
6) Shadowfall is better slotted for resists and endurance reduction.
7) That third slot on hasten isn't getting you all that much. Drop it and put the slot elsewhere to complete a set bonus.
8) You could honestly drop thunderstrike for a travel power and not miss it.
9) You've got the performance shifter +end in your immobilize. This means you'll give your target endurance, not yourself. It should be in stamina.
10) You probably wouldn't miss assault either.
11) Six slot electrifying fences with either Enfeebled operations or Trap of the hunter
12) There is absolutely no justifying putting a proc in Howling Twlight. None. Its got a sixty second recharge, you just spent a slot to immobilize 20% of whatever you hit every 70 seconds.
An AV or GM would absolutely destroy this build. You don't have enough personal defenses to stand toe to toe with anything, your targeted heal would be missing on anything purple constantly, which would kill you pretty quickly. Worse, you don't have provoke, which means that any hard target is just going to chew your bots up one at a time and spit them back out. Bots/Dark can indeed kill AVs and GMs, but not if they're picking off your drones and protectors one at a time, you need to be able to make them focus on you as much as possible. Bots individually can't take **** for damage, but with bodguard and the healing dark can put out you can take a ton of damage.
This is my build, take a look and see how I slotted some thing. Yeah, the LoTGs are expensive, if you can't afford them drop a heal out of fluffy and drop in a recharge IO and he'll still be perma. I've got more than 30% defense to every position with my bot's bubble, provoke, and acrobatics to help me stand up to hard targets. Good enhancement numbers, and alot of the set ios I used came pretty cheap, I think I spent somewhere around 500 million on this not including the LotGs, and running some strike forces can help you make up for lack of money.
Villain Plan by Mids' Villain Designer 1.601
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Mutation Mastermind
Primary Power Set: Robotics
Secondary Power Set: Dark Miasma
Power Pool: Leaping
Power Pool: Fitness
Power Pool: Presence
Power Pool: Leadership
Ancillary Pool: Mu Mastery
Villain Profile:
Level 1: Battle Drones -- BldM'dt-Dmg(A), BldM'dt-Acc/Dmg/EndRdx(3), BldM'dt-Acc/Dmg(3), ExStrk-Dam%(5), SvgnRt-Acc/Dmg/EndRdx(5), SvgnRt-PetResDam(7)
Level 1: Twilight Grasp -- Dct'dW-Heal(A), Dct'dW-Heal/EndRdx/Rchg(7), Dct'dW-Heal/EndRdx(9), Dct'dW-EndRdx/Rchg(9), Dct'dW-Heal/Rchg(11), Acc-I(36)
Level 2: Tar Patch -- TmpRdns-EndRdx/Rchg/Slow(A), P'ngTtl-EndRdx/Rchg/Slow(11), RechRdx-I(31)
Level 4: Darkest Night -- SipInsght-ToHitDeb(A), SipInsght-Acc/ToHitDeb(17), SipInsght-Acc/Rchg(19), SipInsght-ToHitDeb/EndRdx/Rchg(19), SipInsght-%ToHit(21)
Level 6: Equip Robot -- EndRdx-I(A)
Level 8: Combat Jumping -- LkGmblr-Rchg+(A)
Level 10: Hurdle -- Jump-I(A)
Level 12: Protector Bots -- BldM'dt-Dmg(A), BldM'dt-Acc/Dmg/EndRdx(13), SvgnRt-Acc/Dmg(13), SvgnRt-Acc/Dmg/EndRdx(15), DefBuff-I(15), DefBuff-I(17)
Level 14: Super Jump -- Zephyr-Travel(A), Zephyr-Travel/EndRdx(21), Zephyr-ResKB(23)
Level 16: Shadow Fall -- LkGmblr-Rchg+(A), RctvArm-ResDam(23), RctvArm-EndRdx(25), RctvArm-ResDam/EndRdx/Rchg(25), RctvArm-ResDam/EndRdx(31)
Level 18: Health -- Numna-Regen/Rcvry+(A), Mrcl-Rcvry+(33), RgnTis-Regen+(33)
Level 20: Stamina -- P'Shift-EndMod(A), P'Shift-End%(33), EndMod-I(34)
Level 22: Fearsome Stare -- Cloud-ToHitDeb(A), Cloud-Acc/ToHitDeb(34), Cloud-Acc/Rchg(37), Cloud-Acc/EndRdx/Rchg(40), Cloud-ToHitDeb/EndRdx/Rchg(42), Cloud-%Dam(48)
Level 24: Howling Twilight -- EndRdx-I(A), RechRdx-I(34), RechRdx-I(40)
Level 26: Assault Bot -- S'bndAl-Build%(A), BldM'dt-Dmg(27), BldM'dt-Acc/Dmg/EndRdx(27), EdctM'r-PetDef(29), SvgnRt-Acc/Dmg(29), SvgnRt-Acc/Dmg/EndRdx(31)
Level 28: Provoke -- Zinger-Dam%(A), Zinger-Taunt/Rchg/Rng(42), Zinger-Taunt(43)
Level 30: Petrifying Gaze -- BasGaze-Acc/EndRdx/Rchg/Hold(A), BasGaze-EndRdx/Rchg/Hold(36), BasGaze-Acc/Rchg(37), BasGaze-Acc/Hold(37)
Level 32: Upgrade Robot -- EndRdx-I(A)
Level 35: Maneuvers -- LkGmblr-Rchg+(A), LkGmblr-Def/EndRdx(36)
Level 38: Dark Servant -- Cloud-Acc/EndRdx/Rchg(A), Cloud-ToHitDeb/EndRdx/Rchg(39), Cloud-ToHitDeb(39), Cloud-Acc/Rchg(39), Heal-I(40), Heal-I(42)
Level 41: Charged Armor -- S'fstPrt-ResDam/Def+(A), RctvArm-ResDam/EndRdx(43), RctvArm-ResDam/EndRdx/Rchg(43), RctvArm-ResDam(46)
Level 44: Electrifying Fences -- Enf'dOp-Acc/Rchg(A), Enf'dOp-EndRdx/Immob(45), Enf'dOp-Acc/EndRdx(45), Enf'dOp-Immob/Rng(45), Enf'dOp-Acc/Immob(46), Enf'dOp-Acc/Immob/Rchg(46)
Level 47: Tactics -- GSFC-Build%(A), GSFC-ToHit(48), GSFC-ToHit/Rchg(48), GSFC-ToHit/Rchg/EndRdx(50), GSFC-Rchg/EndRdx(50), GSFC-ToHit/EndRdx(50)
Level 49: Acrobatics -- EndRdx-I(A)
------------
Level 1: Brawl -- Acc-I(A)
Level 1: Sprint -- Jump-I(A)
Level 2: Rest -- Heal-I(A)
Level 1: Supremacy
------------
Set Bonus Totals:
- 2.5% DamageBuff(Smashing)
- 2.5% DamageBuff(Lethal)
- 2.5% DamageBuff(Fire)
- 2.5% DamageBuff(Cold)
- 2.5% DamageBuff(Energy)
- 2.5% DamageBuff(Negative)
- 2.5% DamageBuff(Toxic)
- 2.5% DamageBuff(Psionic)
- 5% Defense
- 13.3% Defense(Smashing)
- 13.3% Defense(Lethal)
- 7.69% Defense(Fire)
- 7.69% Defense(Cold)
- 12.7% Defense(Energy)
- 12.7% Defense(Negative)
- 3% Defense(Psionic)
- 12.4% Defense(Melee)
- 14.9% Defense(Ranged)
- 9.56% Defense(AoE)
- 4.5% Max End
- 9% Enhancement(Accuracy)
- 3% Enhancement(Immobilize)
- 51.3% Enhancement(RechargeTime)
- 4% Enhancement(Heal)
- 19% FlySpeed
- 15.1 HP (1.88%) HitPoints
- 19% JumpHeight
- 19% JumpSpeed
- Knockback (Mag -4)
- Knockup (Mag -4)
- MezResist(Confused) 5%
- MezResist(Held) 5%
- MezResist(Immobilize) 7.2%
- MezResist(Sleep) 13.3%
- MezResist(Stun) 5%
- MezResist(Terrorized) 9.95%
- 9% (0.15 End/sec) Recovery
- 20% (0.67 HP/sec) Regeneration
- 10% Resistance(Smashing)
- 10% Resistance(Lethal)
- 11.3% Resistance(Fire)
- 11.3% Resistance(Cold)
- 10% Resistance(Energy)
- 11.9% Resistance(Negative)
- 10% Resistance(Toxic)
- 10% Resistance(Psionic)
- 19% RunSpeed
- 2% XPDebtProtection
Code:
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Hello, would somebody please do me a favor and critique this build as well as answer some questions?
How much do you think this build would cost?
Do you think this build would be able to solo AVs? GMs?
Villain Plan by Mids' Villain Designer 1.601
http://www.cohplanner.com/
Matthew Lee: Level 50 Natural Mastermind
Primary Power Set: Robotics
Secondary Power Set: Dark Miasma
Power Pool: Fitness
Power Pool: Speed
Power Pool: Leadership
Power Pool: Leaping
Ancillary Pool: Mu Mastery
Villain Profile:
------------
Level 1: Battle Drones BldM'dt-Dmg(A), BldM'dt-Acc(3), BldM'dt-Acc/Dmg(3), BldM'dt-Dmg/EndRdx(5), BldM'dt-Acc/EndRdx(5), ExStrk-Dam%(7)
Level 1: Twilight Grasp Nictus-Heal(A), Nictus-Acc/EndRdx/Rchg(7), Nictus-Heal/HP/Regen/Rchg(9)
Level 2: Tar Patch TmpRdns-Acc/Slow(A), RechRdx-I(9), TmpRdns-EndRdx/Rchg/Slow(11), RechRdx-I(11)
Level 4: Darkest Night DampS-ToHitDeb/EndRdx(A), DampS-ToHitDeb(17), DampS-ToHitDeb/Rchg/EndRdx(19), ToHitDeb-I(19)
Level 6: Equip Robot EndRdx-I(A), EndRdx-I(40)
Level 8: Hurdle Empty(A)
Level 10: Howling Twilight RzDz-Immob%(A), Rope-Acc/Stun/Rchg(21), RechRdx-I(21), RechRdx-I(46)
Level 12: Protector Bots SvgnRt-PetResDam(A), SvgnRt-Acc/Dmg(13), SvgnRt-Dmg/EndRdx(13), SvgnRt-Acc/Dmg/EndRdx(15), DefBuff-I(15), DefBuff-I(17)
Level 14: Health Heal-I(A), Heal-I(37), Heal-I(37)
Level 16: Shadow Fall RedFtn-Def/EndRdx(A), RedFtn-EndRdx(23), RedFtn-Def(23), RedFtn-Def/EndRdx/Rchg(25)
Level 18: Hasten RechRdx-I(A), RechRdx-I(25), RechRdx-I(27)
Level 20: Fearsome Stare SipInsght-%ToHit(A), SipInsght-ToHitDeb(27), SipInsght-Acc/ToHitDeb(29), SipInsght-ToHitDeb/EndRdx/Rchg(29)
Level 22: Stamina EndMod-I(A), EndMod-I(31), EndMod-I(31)
Level 24: Assault EndRdx-I(A)
Level 26: Assault Bot S'bndAl-Dmg(A), S'bndAl-Dmg/Rchg(31), S'bndAl-Acc/Dmg/Rchg(33), S'bndAl-Acc/Rchg(33), Acc-I(33), S'bndAl-Build%(34)
Level 28: Tactics AdjTgt-ToHit(A), AdjTgt-ToHit/EndRdx(34), AdjTgt-ToHit/EndRdx/Rchg(34), AdjTgt-EndRdx/Rchg(36)
Level 30: Maneuvers DefBuff-I(A), DefBuff-I(36), DefBuff-I(36), EndRdx-I(37)
Level 32: Upgrade Robot EndRdx-I(A), EndRdx-I(43)
Level 35: Combat Jumping ULeap-Stlth(A)
Level 38: Dark Servant RechRdx-I(A), ToHitDeb-I(39), ToHitDeb-I(39), Acc-I(39), RechRdx-I(40), RechRdx-I(40)
Level 41: Charged Armor S'fstPrt-ResKB(A), TtmC'tng-ResDam(42), TtmC'tng-ResDam/EndRdx(42), TtmC'tng-ResDam/EndRdx/Rchg(42), TtmC'tng-ResDam/Rchg(43), TtmC'tng-EndRdx(43)
Level 44: Electrifying Fences GravAnch-Hold%(A), P'Shift-End%(45), Acc-I(45), Acc-I(45), RechRdx-I(46), RechRdx-I(46)
Level 47: Thunder Strike Sciroc-Acc/Dmg(A), Sciroc-Dmg/Rchg(48), Sciroc-Dmg/EndRdx(48), Sciroc-Acc/Rchg(48)
Level 49: Petrifying Gaze Lock-Acc/Hold(A), Lock-Acc/Rchg(50), Lock-Rchg/Hold(50), Lock-Acc/EndRdx/Rchg/Hold(50)
------------
Level 1: Brawl Empty(A)
Level 1: Sprint Empty(A)
Level 2: Rest Empty(A)
Level 1: Supremacy
------------
Set Bonus Totals:
13% DamageBuff(Smashing)
13% DamageBuff(Lethal)
13% DamageBuff(Fire)
13% DamageBuff(Cold)
13% DamageBuff(Energy)
13% DamageBuff(Negative)
13% DamageBuff(Toxic)
13% DamageBuff(Psionic)
3.75% Defense(Fire)
3.75% Defense(Cold)
4.69% Defense(AoE)
1.8% Max End
2.5% Enhancement(Held)
36% Enhancement(Accuracy)
4% FlySpeed
51.2 HP (6.38%) HitPoints
4% JumpHeight
4% JumpSpeed
Knockback (Mag -4)
Knockup (Mag -4)
MezResist(Confused) 2.75%
MezResist(Held) 9.35%
MezResist(Immobilize) 2.2%
MezResist(Sleep) 4.95%
MezResist(Stun) 6.6%
3% (0.05 End/sec) Recovery
26% (0.87 HP/sec) Regeneration
10% Resistance(Smashing)
10% Resistance(Lethal)
11.3% Resistance(Fire)
11.3% Resistance(Cold)
11.3% Resistance(Energy)
14.4% Resistance(Negative)
10% Resistance(Toxic)
10% Resistance(Psionic)
4% RunSpeed
2% XPDebtProtection
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