Not bad so far however you seem to have skipped Screech which is one of the best attacks in the Sonic set. A Mag3 stun which will couple really nicely with Howling Twilight if you want to use it as a control rather than a rez (three recharges = up every minute). I'd say consider dropping Howl to get it. Howl is mediocre on a Blaster so I think it'd only be useful on a Defender for applying the -res to an entire spawn. I guess it depends on what you're going for.
In terms of order, personally I'd take Fearsome Stare as soon as it becomes available and leave Shadowfall till about 22. With that and Darkest Night running, it could get quite expensive in terms of endurance. Once you've got Stamina and SOs, it'll become a lot easier on the blue bar.
Amplify is an ok buff but it's not as important as some of the other powers in the sets. I've never found Aim style powers much use on Defenders but your mileage may vary as they say.
As for your epics, consider Oppressive Gloom rather than Dark Consumption. It's another stun to add to your arsenal of stuns and is great for keeping you safe in melee range. On my D3, I don't get into melee much unless I'm nuking them or using Howling Twilight on a fallen ally but when I do, it's wildly effective at mitigating damage and costs very little. It costs piddling amounts of endurance and the self damage is completely mitigated with Health.
Hope that helps some. 
@Dante EU - Union Roleplayer and Altisis Victim
The Militia: Union RP Supergroup - www.themilitia.org.uk
Personally I skipped Siren's Song (and acrobatics since I'm never in melee and things should be whiffing anyway). I'd take Screech instead of Petrifying Gaze for the ability to stack with Howling Twilight (and Oppressive Gloom if you take it).
Take Fearsome Stare at 16, you can leave Shadowfall off until you get Stamina IMO. Fearsome Stare is your #1 power in Dark IMO, you want it ASAP.
I took Howling Twilight earlier too, with 3 recharge in there it becomes a great mez & boss debuff. Although on teams you're then always stuck with the choice "If I mez them with Howling now will someone end up dying in 10 seconds time".
Great... That really helped alot!
I won't bother you with the updated build, but I did as you guys suggested and I'm now happy with what I got.
Thanks alot
Hi,
I rolled a dark/sonic/dark defender... The sets have so many cool powers I don't really know in what order to grab them. As with all my toons this one is PvE oriented for both solo and team play.
This is what I came up with so far. I feel tho that I might have taken Howling Twilight and Petrifying Gaze a bit too late, and Amplify, but I didn't come up with a better plan.
And the slotting, that's another chapter... I'll start with that once I got the powers right.
Hero Plan by Mids' Hero Designer 1,401
http://www.cohplanner.com/
[u]Click this DataLink to open the build![u]
Dark Voice of Reason: Level ?? Natural Defender
Primary Power Set: Dark Miasma
Secondary Power Set: Sonic Attack
Power Pool: Leaping
Power Pool: Fitness
Ancillary Pool: Dark Mastery
Hero Profile:
Level 1: Twilight Grasp -- (A)
Level 1: Shriek -- (A)
Level 2: Tar Patch -- (A)
Level 4: Scream -- (A)
Level 6: Darkest Night -- (A)
Level 8: Shadow Fall -- (A)
Level 10: Howl -- (A)
Level 12: Combat Jumping -- (A)
Level 14: Super Jump -- (A)
Level 16: Swift -- (A)
Level 18: Health -- (A)
Level 20: Stamina -- (A)
Level 22: Acrobatics -- (A)
Level 24: Fearsome Stare -- (A)
Level 26: Shout -- (A)
Level 28: Siren's Song -- (A)
Level 30: Petrifying Gaze -- (A)
Level 32: Dark Servant -- (A)
Level 35: Howling Twilight -- (A)
Level 38: Dreadful Wail -- (A)
Level 41: Dark Consumption -- (A)
Level 44: Dark Embrace -- (A)
Level 47: Soul Drain -- (A)
Level 49: Amplify -- (A)
------------
Level 1: Brawl -- (A)
Level 1: Sprint -- (A)
Level 2: Rest -- (A)
Level 1: Vigilance
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Please help me!!!