Ninja/Dark Endgame Setup

[Sasirrine]

Hi all - I'm working on a ninja blade/dark stalker and he's doing pretty well. Only died a couple times so far with him and I was fooling around with an endgame goal. It's probably ridiculously expensive, but could someone help me out if I'm making some really bad choices, or something that doesn't make any sense? 

Here it is: 

Villain Plan by Mids' Reborn : Hero Designer 2.7.2.10
https://github.com/Crytilis/mids-reborn-hero-designer

Click this DataLink to open the build!

Naux: Level 50 Magic Stalker
Primary Power Set: Ninja Blade
Secondary Power Set: Dark Armor
Power Pool: Flight
Power Pool: Speed
Power Pool: Teleportation
Ancillary Pool: Soul Mastery

Villain Profile:
Level 1: Sting of the Wasp -- SmsHym-Dmg/Rchg(A), SmsHym-Dmg/EndRdx/Rchg(15), SmsHym-Acc/Dmg(19), SmsHym-Dmg/EndRdx(27)
Level 1: Hide -- Ksm-ToHit+(A)
Level 2: Gambler's Cut -- TchofLadG-%Dam(A), TchofLadG-DefDeb(19), TchofLadG-DefDeb/Rchg(25), TchofLadG-DefDeb/Rchg/EndRdx(25), TchofLadG-Rchg/EndRdx(27), TchofLadG-DefDeb/EndRdx(29)
Level 4: Dark Embrace -- UnbGrd-Max HP%(A), UnbGrd-ResDam(7), UnbGrd-ResDam/EndRdx(7)
Level 6: Assassin's Blade -- SprAssMar-Rchg/Rchg Build Up(A), SprAssMar-Acc/Dmg/EndRdx/Rchg(11), SprAssMar-Dmg/EndRdx/Rchg(11), SprAssMar-Acc/Dmg/Rchg(13), SprAssMar-Dmg/Rchg(13), SprAssMar-Acc/Dmg(15)
Level 8: Murky Cloud -- ImpArm-ResPsi(A), ImpArm-ResDam(9), ImpArm-ResDam/EndRdx(9)
Level 10: Shadow Dweller -- Krm-ResKB(A), Krm-Def/Rchg(29), Krm-Def/EndRdx(50)
Level 12: Build Up -- AdjTrg-ToHit(A), AdjTrg-Rchg(31), AdjTrg-ToHit/Rchg(43), AdjTrg-ToHit/EndRdx/Rchg(45)
Level 14: Placate -- RechRdx-I(A)
Level 16: Obsidian Shield -- Ags-Psi/Status(A), Ags-ResDam/EndRdx(17), Ags-ResDam(17)
Level 18: Fly -- Frb-Stlth(A), Frb-Fly(34), Frb-EndRdx(36)
Level 20: Dark Regeneration -- TchoftheN-%Dam(A), TchoftheN-Heal(21), TchoftheN-Acc/Heal(21)
Level 22: Hasten -- RechRdx-I(A), RechRdx-I(23), RechRdx-I(23)
Level 24: Teleport -- Tim&SpcMn-Rng(A)
Level 26: Divine Avalanche -- GifoftheA-Def/EndRdx/Rchg(A), GifoftheA-Def(40), GifoftheA-Run+(40)
Level 28: Cloak of Fear -- GlmoftheA-Dam%(A), GlmoftheA-Acc/Fear/Rchg(37), GlmoftheA-Acc/Rchg(37), GlmoftheA-EndRdx/Fear(37), GlmoftheA-Acc/EndRdx(39), GlmoftheA-Fear/Rng(40)
Level 30: Soaring Dragon -- Bns-Acc/Rchg(A), Bns-Dmg/EndRdx(31), Bns-Acc/Dmg(31)
Level 32: Golden Dragonfly -- SprStlGl-Rchg/Hide%(A), SprStlGl-Acc/Dmg/EndRdx/Rchg(33), SprStlGl-Acc/Dmg(33), SprStlGl-Dmg/Rchg(33), SprStlGl-Acc/Dmg/Rchg(34), SprStlGl-Dmg/EndRdx/Rchg(34)
Level 35: Moonbeam -- Dcm-Build%(A), Dcm-Acc/Dmg/Rchg(36), Dcm-Acc/EndRdx/Rchg(36), Dcm-Dmg/Rchg(46), Dcm-Dmg/EndRdx(46), Dcm-Acc/Dmg(50)
Level 38: Soul Transfer -- EnrMnp-Stun%(A), EnrMnp-EndMod(39), EnrMnp-EndMod/Rchg(39)
Level 41: Soul Storm -- GhsWdwEmb-Acc/Hold/Rchg(A), GhsWdwEmb-Dam%(42), GhsWdwEmb-Acc/Rchg(42), GhsWdwEmb-EndRdx/Hold(42), GhsWdwEmb-Acc/EndRdx(43), GhsWdwEmb-Hold/Rng(43)
Level 44: Shadow Meld -- ShlWal-ResDam/Re TP(A), ShlWal-Def(45), ShlWal-Def/EndRdx(45), ShlWal-Def/Rchg(46), ShlWal-EndRdx/Rchg(48), ShlWal-Def/EndRdx/Rchg(50)
Level 47: Dark Blast -- Slv-Acc/Dmg/EndRdx/Rng(A), Slv-Dmg/EndRdx/Rchg(48), Slv-Acc/Dmg(48)
Level 49: Recall Friend -- Empty(A)
Level 1: Assassination 
Level 1: Brawl -- Empty(A)
Level 1: Quick Form 
Level 1: Prestige Power Dash -- Empty(A)
Level 1: Prestige Power Slide -- Empty(A)
Level 1: Prestige Power Quick -- Empty(A)
Level 1: Prestige Power Rush -- Empty(A)
Level 1: Prestige Power Surge -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 4: Ninja Run 
Level 2: Swift -- Empty(A)
Level 2: Health -- Pnc-Heal/+End(A), Pnc-Heal(3), Pnc-Heal/EndRedux(3)
Level 2: Hurdle -- Empty(A)
Level 2: Stamina -- PwrTrns-+Heal(A), PwrTrns-EndMod(5), PrfShf-End%(5)
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Thanks in advance!