No idea. There are many skills in the game that do not come from Masteries.
Also I was talking in general terms, not only specific to the OPs build (which we do not know atm other than masteries)
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Well we can all do supid things in this game for sure 
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I did with my first character. Try Lightning Warder without Wind Devil and Arcane bomb 
Thank you all for answering.
I include screen shots
Both swords are very similar.
The first one shows both swords in the slots. You can see DPS is 7506 and you can see the left weapon.
The second shot shows the second sword.
The third shot shows the DPS without one of the swords with a DPS of 7981. Does not matter which slot it is in.
I want to understand why does it do that?
Can you provide us a grimtools link?
That is because cadence dual wield is sketchy and dps stat in game is not working correctly. Look what happens if you switch left skill to regular attack. And also look on second char stat window for cadence damage when using one versus two weapon
Thank you I will check that. The point of night blade is to have two swords 
There are other ways to have two swords. There are relics and medals that allow that for instance
Really? how? Amazing game, you need a PhD to play at this game
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https://www.grimtools.com/db/items/1506
https://www.grimtools.com/db/items/8954
https://www.grimtools.com/db/items/798
https://www.grimtools.com/db/items/1473
https://www.grimtools.com/db/items/1493
https://www.grimtools.com/db/items/1516
https://www.grimtools.com/db/items/13754
https://www.grimtools.com/db/items/13786
https://www.grimtools.com/db/items/13711
https://www.grimtools.com/db/items/12126
https://www.grimtools.com/db/items/12131
some are easy to get like some of the relics (faction shops etc) others are random drops
similar for ranged, no need in being inquisitor to use dual pistol
Just look in grim tools, like search “dual wield” and you get items
Thank you. They are at lvl 94 though
I will need to test that on one of my lvl 100 pure soldier
no there are many that are not level 94 like these
https://www.grimtools.com/db/items/1473 buy from devil cross faction
https://www.grimtools.com/db/items/1493 often sells by hyram in steelclap of you have saved him
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Unfortunately I have no idea why your dps decreases when equip second sword. @Ulvar1 's idea might be correct yet I have never encounter such thing in this game. I experienced some other dps tooltip bugs but not such this one. But your main-hand weapon is 92 level in the grimtools.
Ok WOW Thank you very much another thing to look for. it is never ending
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if blue print of item, click it and you can see list of who can sell it. Almsot everything you wanna know is in grim tool
I did the calculator fast but if you look at the picture higher up I have proved it.
Thank you again
you can upload current character in grim tool
What should I use instead of Cadence?