Dark Servant is best at ToHit debuffing really. I usually aim to max out his -ToHit first. That way he makes an excellent pseudo-tank. He's not the toughest but his PBAOE aura + Darkest Night + Heal make him hard to hit and decent at healing back the damage.
I'd certainly slot -ToHit over Hold since he can be a bit [censored] deciding who to hit the hold with.
I start by saying I have no experience in building a Dark/Dark (or much any other defender), but someone I know was asking for a build so I gave it a try. My comments are mostly aimed at him though if anyone sees a way to improve the build please say so.
I did a standard recharge build mostly for Tar Patch and the other goodies like Howling Twilight, Fearsome Stare, etc. Keep in mind Howling Twilight is a massive *auto-hit* stun, so don't hoard it, it comes back in 60 seconds anyway.
Tar Patch coming back at 28 seconds is good enough to use at every spawn, I think.
I'm not sure if Dark Servant is slotted best, and I did not took Blackstar because the idea of throwing all endurance away seems like anathema for a defender (but can be switched for Total Focus I suppose). Twilight Grasp only has 42% accuracy but there is 57% accuracy in global bonuses floating around.
I also aimed for a cheap build of which I think only the Positron Blasts detract, but, if aiming for level 40 enhances instead of level 50 the prices will go down a fair bit and the loss in % is minimal.
Shadowfall + SS = invisibility, so Recall Friend is a good complement to a character than can be a good stealther.
Hero Plan by Mids' Hero Designer 1,401
http://www.cohplanner.com/
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Level 50 Magic Defender
Primary Power Set: Dark Miasma
Secondary Power Set: Dark Blast
Power Pool: Speed
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Teleportation
Ancillary Pool: Power Mastery
Hero Profile:
Level 1: Twilight Grasp -- Dct'dW-Heal/EndRdx(A), Dct'dW-EndRdx/Rchg(3), Dct'dW-Heal/Rchg(3), Dct'dW-Heal/EndRdx/Rchg(5), Dct'dW-Heal(5), Acc-I(7)
Level 1: Dark Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/Rchg(7), Thundr-Acc/Dmg/Rchg(9), Thundr-Acc/Dmg/EndRdx(9), Thundr-Dmg/EndRdx/Rchg(11)
Level 2: Gloom -- Thundr-Acc/Dmg(A), Thundr-Acc/Dmg/EndRdx(13), Thundr-Dmg/EndRdx/Rchg(13), Thundr-Acc/Dmg/Rchg(15), Thundr-Dmg/Rchg(15)
Level 4: Tar Patch -- RechRdx-I(A), RechRdx-I(17), RechRdx-I(19)
Level 6: Darkest Night -- DarkWD-ToHitDeb(A), DarkWD-ToHitDeb/Rchg(19), DarkWD-Rchg/EndRdx(21), DarkWD-ToHitDeb/EndRdx(21)
Level 8: Shadow Fall -- RedFtn-Def/EndRdx(A), RedFtn-Def/EndRdx/Rchg(11), RedFtn-EndRdx(17), RedFtn-Def/Rchg(23), RedFtn-EndRdx/Rchg(23)
Level 10: Hasten -- RechRdx-I(A), RechRdx-I(27), RechRdx-I(27)
Level 12: Hurdle -- Jump-I(A)
Level 14: Super Speed -- Run-I(A)
Level 16: Fearsome Stare -- Abys-Acc/Rchg(A), Abys-Acc/EndRdx(29), Abys-Acc/Fear/Rchg(29), Abys-Fear/Rng(31), Abys-EndRdx/Fear(31)
Level 18: Health -- Heal-I(A)
Level 20: Stamina -- P'Shift-EndMod(A), P'Shift-EndMod/Rchg(33), P'Shift-End%(33), P'Shift-EndMod/Acc(33)
Level 22: Tenebrous Tentacles -- Posi-Acc/Dmg(A), Posi-Dam%(25), Det'tn-Acc/Dmg/EndRdx(31), Posi-Acc/Dmg/EndRdx(34), Posi-Dmg/Rchg(34), Posi-Dmg/Rng(34)
Level 24: Night Fall -- Posi-Acc/Dmg(A), Posi-Acc/Dmg/EndRdx(25), Posi-Dmg/Rchg(37), Posi-Dmg/Rng(37), Posi-Dam%(37), Det'tn-Acc/Dmg/EndRdx(39)
Level 26: Combat Jumping -- Krma-ResKB(A)
Level 28: Howling Twilight -- Stpfy-Acc/Rchg(A), Stpfy-Acc/EndRdx(39), Stpfy-Stun/Rng(39), Stpfy-Acc/Stun/Rchg(40), Stpfy-EndRdx/Stun(40), RechRdx-I(40)
Level 30: Dark Pit -- Stpfy-Acc/Rchg(A), Stpfy-EndRdx/Stun(42), Stpfy-Acc/EndRdx(42), Stpfy-Stun/Rng(42), Stpfy-Acc/Stun/Rchg(43), RechRdx-I(43)
Level 32: Dark Servant -- Nictus-Heal(A), Nictus-Heal/HP/Regen/Rchg(43), Nictus-Acc/EndRdx/Rchg(45), EoCur-Acc/Hold(45), EoCur-Acc/Hold/Rchg(45), G'Wdw-Acc/Hold/Rchg(46)
Level 35: Petrifying Gaze -- EoCur-Acc/Rchg(A), EoCur-Acc/EndRdx(36), EoCur-EndRdx/Hold(36), EoCur-Acc/Hold/Rchg(36), RechRdx-I(50)
Level 38: Recall Friend -- Range-I(A)
Level 41: Conserve Power -- RechRdx-I(A), RechRdx-I(46)
Level 44: Power Build Up -- RechRdx-I(A), RechRdx-I(46)
Level 47: Total Focus -- C'ngImp-Acc/Dmg(A), C'ngImp-Dmg/Rchg(48), C'ngImp-Acc/Dmg/Rchg(48), C'ngImp-Acc/Dmg/EndRdx(48), C'ngImp-Dmg/EndRdx/Rchg(50), Mako-Acc/EndRdx/Rchg(50)
Level 49: Swift -- Run-I(A)
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Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Vigilance