Well, this is a build I worked on some time ago. My current Dark/Sonic/Dark isn't following it exactly, but I don't think this build is too bad to start with. Modify as you see fit.
Of course, it could be awful, but I'll let the Dark experts weigh in on that.
Edit: This is probably somewhere between a cheap and an average-cost build. I only went with expensive recipes ($1+ million) when I felt it was worth the cost, like Positron's Blast and the purple sleep set. No recipe here should run more than a few million influence.
Hero Plan by Mids' Hero Designer 1.401
http://www.cohplanner.com/
[u]Click this DataLink to open the build![u]
Alex Marin: Level 50 Mutation Defender
Primary Power Set: Dark Miasma
Secondary Power Set: Sonic Attack
Power Pool: Leaping
Power Pool: Fitness
Power Pool: Speed
Power Pool: Leadership
Ancillary Pool: Dark Mastery
Hero Profile:
Level 1: Twilight Grasp -- Acc-I(A), Dct'dW-Heal/EndRdx(3), Dct'dW-Heal(3), Dct'dW-Heal/Rchg(5), Dct'dW-Heal/EndRdx/Rchg(5), Dct'dW-EndRdx/Rchg(7)
Level 1: Shriek -- Thundr-Acc/Dmg(A), Thundr-Acc/Dmg/EndRdx(7), Thundr-Acc/Dmg/Rchg(9), Thundr-Dmg/EndRdx(9)
Level 2: Tar Patch -- RechRdx-I(A), RechRdx-I(11), TmpRdns-EndRdx/Rchg/Slow(11)
Level 4: Darkest Night -- DarkWD-ToHitDeb(A), DarkWD-ToHitDeb/Rchg(13), DarkWD-ToHitdeb/Rchg/EndRdx(13), DarkWD-Rchg/EndRdx(15), DarkWD-ToHitDeb/EndRdx(15)
Level 6: Howl -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(17), Posi-Dmg/Rchg(17), Posi-Dmg/Rng(19), Posi-Acc/Dmg/EndRdx(19), Range-I(21)
Level 8: Scream -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(21), Thundr-Dmg/Rchg(23), Thundr-Acc/Dmg/Rchg(23), Thundr-Acc/Dmg/EndRdx(25), Thundr-Dmg/EndRdx/Rchg(25)
Level 10: Combat Jumping -- Krma-ResKB(A)
Level 12: Fearsome Stare -- Acc-I(A), DarkWD-ToHitDeb(27), DarkWD-ToHitDeb/Rchg(27), DarkWD-ToHitdeb/Rchg/EndRdx(29), DarkWD-Rchg/EndRdx(29)
Level 14: Super Jump -- Jump-I(A)
Level 16: Hurdle -- Jump-I(A)
Level 18: Health -- Heal-I(A)
Level 20: Stamina -- P'Shift-End%(A), P'Shift-EndMod(31), EndMod-I(31)
Level 22: Shout -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(31), Thundr-Dmg/Rchg(33), Thundr-Acc/Dmg/Rchg(33), Thundr-Acc/Dmg/EndRdx(33), Thundr-Dmg/EndRdx/Rchg(34)
Level 24: Shadow Fall -- EndRdx-I(A), EndRdx-I(34), Aegis-Psi/Status(50)
Level 26: Howling Twilight -- Stpfy-Acc/Rchg(A), Stpfy-EndRdx/Stun(37), Stpfy-Acc/EndRdx(43), Stpfy-Stun/Rng(43), Stpfy-Acc/Stun/Rchg(46)
Level 28: Siren's Song -- FtnHyp-Sleep/Rchg(A), FtnHyp-Acc/Sleep/Rchg(34), FtnHyp-Acc/Rchg(36), FtnHyp-Sleep/EndRdx(36), FtnHyp-Sleep(36)
Level 30: Hasten -- RechRdx-I(A), RechRdx-I(37), RechRdx-I(37)
Level 32: Dark Servant -- DampS-ToHitDeb(A), DampS-ToHitDeb/Rchg(39), DampS-ToHitDeb/Rchg/EndRdx(39), Acc-I(39), H'zdH-Heal(40), H'zdH-Heal/EndRdx(40)
Level 35: Screech -- Stpfy-Acc/Rchg(A), Stpfy-EndRdx/Stun(43), Stpfy-Acc/EndRdx(46), Stpfy-Stun/Rng(46), Stpfy-Acc/Stun/Rchg(50)
Level 38: Dreadful Wail -- C'ngBlow-Acc/Dmg(A), C'ngBlow-Dmg/EndRdx(40), C'ngBlow-Dmg/Rchg(42), C'ngBlow-Acc/Rchg(42), M'Strk-Dmg/Rchg(42)
Level 41: Oppressive Gloom -- Acc-I(A)
Level 44: Dark Consumption -- P'Shift-EndMod(A), P'Shift-EndMod/Acc(45), P'Shift-Acc/Rchg(45), P'Shift-EndMod/Acc/Rchg(45)
Level 47: Soul Drain -- Acc-I(A), RechRdx-I(48), RechRdx-I(48), RechRdx-I(48)
Level 49: Assault -- EndRdx-I(A), EndRdx-I(50)
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Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Vigilance
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[u]Set Bonus Totals:[u]<ul type="square">[*]5% DamageBuff(Smashing)[*]5% DamageBuff(Lethal)[*]5% DamageBuff(Fire)[*]5% DamageBuff(Cold)[*]5% DamageBuff(Energy)[*]5% DamageBuff(Negative)[*]5% DamageBuff(Toxic)[*]5% DamageBuff(Psionic)[*]11.3% Defense(Energy)[*]11.3% Defense(Negative)[*]9.38% Defense(Ranged)[*]1.8% Max End[*]43.8% Enhancement(RechargeTime)[*]4% Enhancement(Heal)[*]45% Enhancement(Accuracy)[*]6% Enhancement(Stun)[*]18% FlySpeed[*]87.7 HP (8.63%) HitPoints[*]18% JumpHeight[*]18% JumpSpeed[*]Knockback (Mag -4)[*]Knockup (Mag -4)[*]MezResist(Terrorized) 2.2%[*]25% (0.42 End/sec) Recovery[*]5.36% Resistance(Fire)[*]5.36% Resistance(Cold)[*]3% Resistance(Psionic)[*]18% RunSpeed[/list]
Bye, everybody!
*Champion*
How would the experts feel about putting the "Steadfast perception: Res/Def" in Shadow Fall?
50's: Heroes: Ozmeth DB/WP; Black Decker DM/Regen; Shado-Strike DM/SR Scrapper (13 AV soloed); Desert-Shock Claws/Elec Scrapper; Shado-Shriek Dark/Son Def
Villains: Bokken Nin/Nin
Current project(s):
I'm surprised more people haven't posted their builds. Mine isn't even that good.
As far as the +Def IO goes, I'm sure it would be a great addition. It would stack well with all the -tohit, and Shadowfall and CJ have their own little bits of defense, as well.
Bye, everybody!
*Champion*
[ QUOTE ]
How would the experts feel about putting the "Steadfast perception: Res/Def" in Shadow Fall?
[/ QUOTE ]
I'd really try to find somewhere else to put it, like Dark Embrace. Shadow's Fall is absolutely crying for slots, since enhancing the resistance is nice, and if you're building up Defence you'll want to enhance that too. And end reducation doesnt hurt either. I usually go 1 Res IO, 2 Res/End IOs, 2 Def/End IOs and 1 Def IO, for maximum end reduction and around 90% maximum Def and Res slotting.
I dont think the build listed had Dark Embrace, but I got it for my Dark/Rad/Dark.
If you dont take Dark Embrace, then OK, go on then. 
Replace one of the Res/Ends with it. At least the Steadfast Unique also boosts resistance in the power, and you probably wont notice the slightly increased end cost.
I'm dusting off my 50 Dark/Sonic/Dark was a long time since i played her, since i played a fender... would be glad to get build sugestions for her. Thank your thoughts!