[RIGHT]Might controls everything
—Vergil, Devil May Cry 3[/RIGHT]
Hello, grim comrades! 
Since I don’t post previous versions of my blademaster build on forum, let me introduce Ultimate Reaper - a really powerful dual wielding blademaster with good survivability.
First of all - some stats and video.
Gameplay: https://www.youtube.com/watch?v=9ggalSEmubY
Stats with auras and pneumatic burst:
With buffs in battle:
Conception of build (in brief):
Beronath fury + Shadow strike 26 lvl with Falcon swoop 20 lvl and deprametan claw\slicer with “of the wastes” (50 reduced res) suffix. This is the main difference from other dual wielding endgame blademaster builds.
Why deprametan claw? Because main damage of build - it’s pierce damage. Claw\Slicer gives 55% convert physical into pierce and with Blade of Nadaan constellation all physical damage (well, not all, because Shard of Beronath) on main hand convert to pierce. Very effective.
With other hand - Night’s chill 14 lvl + Assassin’s Mark 20 lvl and “of the wastes” suffix = -(38% + 33% +50%) =-121% pierce res.
It’s very effective combination and gives excellent results. Just look at that:
The Iron Maiden for 18 sec: https://www.youtube.com/watch?v=K4tbnvKM-RQ
BennJhar for 20 sec: https://www.youtube.com/watch?v=1E0M6_ncNoo
Other tough guys:
Fabius - about 20-25 second.
Valdaran - about 30 sec.
Moosilauke - about 1 min (just because he has two forms)
Loghorrean - about 50-60 sec.
Other game bosses - about 5-20 sec.
As result - small collection without deaths 
:
Clone of John Bourbon (without kill rest of clones) - about 4 min (even with yellow claw and without Falcon Swoop!) in 1.0.0.2 - https://www.youtube.com/watch?v=wSCb2bg2V2s
Gear, skills and devotion in this video: https://www.youtube.com/watch?v=fHNT5XzDEO4
Grimcalc without gear bonuses: http://grimcalc.com/build/nHwbKh
Grimcalc with gear bonuses: http://grimcalc.com/build/ufRwL4
NOTE. Build have 10450 hp with 51 point in Physique. So I recommend slightly more - 56 and it gives about 10600 hp.
Pros:
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Extremely high damage.
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Very good survivability for DD build.
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Very flexible build, easy to customize.
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Lots of fun
Cons:
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Extremely high gear requirements. I attached to post superior claw of the wastes + boots, but still.
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High energy consumption.
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Instable damage.
Few thoughts about some part of gear (rest is more or less clear, I suppose):
Pants. Legwraps of the Tranquil Mind. For resistances and spirit bonus (for rings and amulet spirit req).
Deathmarked Decapitator. Need 4 parts of set for +2 to all skills in Nightblade.
Haunted Steel (Deathmarked Decapitator). For quick health recovery when you fighting with hordes of mobs, even without Bloodthirster.
Arcane Spark (Badge of Mastery). Without this component you will suffer for very high energy consumption.
Aegis relic. Best completion bonus +% DA, it’s impotant. If you don’t have this bonus - up field command and shadow dance skills
And finally about main part of gear - Deprametan Claw\Slicer.
Fastest way to get this thing - it’s farm Grand Viziers (and other heroes) in Royal hive. Also you may use mods with increasing numbers of mobs. Few attempts - and you will get something like this:
Also, there is many good rare prefixes for this build such like bloodthirsty, frenzied, relentless, officers, tyrant, etc.
Hardcore mode
I think it’s possible, but only for experienced players. Follow this advice (for 85 lvl Ultimate):
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Avoid (especially, ESPECIALLY in Bastion of Chaos) poison\aether\chaos\etc puddles (I mean monsters attacks, not ground effect) or at least do not stand too long. If you fully surrounded in toxic puddle - use blade barrier
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Pneumatic burst should be a permanently effect, not from time to time
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If you fight with serious boss
emesis - do not let your hp drop below about 70-80% . -
If your char catched some reduce resistances - run!
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Do not fight with the Iron Maiden without lots of elixirs. NEVER. If you want a 100% guarantee - don’t mess or choose another side. Zantarin - just a plush toy in comparison with her.
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Use Spiritbane Ointment if you fight with Anasteria and Bloodbound Ointment if you going in Bastiom of Chaos.
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Use Hoarfrost Ointment if you fight with Moosilauke.
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Be careful with reflectors.
That’s all and I hope what it was interesting for you (and hope what you understand my awful English :p).
PS You also may use slightly another variant (Thanks TomoDaK for idea) with dryad’s blessing instead turtle shell and with +1 active skill (Blade arc). It works fine too.
Attachment: DepClaw and boots.zip
Attachment: Untitled.png
! I especially applaud the way you covered up your weak points without sacrificing too much dps.
I think skills spent in class are up to preference, but there is something I dislike about your devotion setup. I would dump turtle for dryad as the shield just does not scale well. Then the 3 points from can Lion go into the 2x 5% HP nodes in the middle and the flat physical node on Oleron, or the 4% node in lion if you really want more hp.