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The Infiltrator introduces a unique playstyle, not too dis-similar to a melee veteran playstyle, but it has a unique twist, and relies on a degree of planning and being tactical in your choices. Infiltrate, in short, makes you invisible for a short while. When you attack, you exit invisibility and deal a flat 30% increase in damage across the board, before factoring in any other damage increases. In addition, you have increased movement speed while invisible, and suppress enemies when you exit invisibility. The tactical aspects come in here, using this can get you into very nice position to quickly take out elites with your revolver or sword. It can also be used to revive allies without issue. It can also just be used to suppress enemies that are affecting your team. The uses for Infiltrator go far beyond just dealing a bit more damage. When used smartly, a good infiltration veteran can be amazing.

With movement speed being such a crucial benefit to this build, the Duealling Sword, while being strong on its own, has no comparrison when it comes to movement speed. That being said, here are the blessings.
Thrust, speaks for itself, when you charge your heavy attack, you’ll deal bonus damage, and that can stack up to 60% increase. The charge attack on this weapon is a stabbing motion forward, it does great single target damage. Using Thrust only increases that amount, so you can eliminate elites that much faster.
Uncanny Strike is another weakspot benefitter, increasing your read on enemy weapon spot hits. While it does stack with Thrust, it’s also useful against hordes when using your light attacks, making them that much more deadly.
Maniacs and Carapace are taken for when you use infiltrate. Since these 2 enemy types usually correspond to the bigger threats, you’ll be using infiltrate to take them out, and having an added bonus damage ontop of everything, it will make it easier to kill them.

The range weapon of choice is something you can quickly draw, and use to aim on elites when infiltrating. Surgical is one of the often looked over blessings, because it relies on you aiming for an extended period of time to get the maximum benefit. Thanks to Infiltrate, we can spend that extra couple seconds lining up our shot, which doubles into the increased critical strike chance.
On the chance you don’t kill the enemy with the opening shot out of infiltration, Hand-Cannon is the next blessing, increasing Rending on a critical hit. When using Surgical, you’re guaranteed a critical hit after aiming for a short while.
Flak and Unyielding are taken to be helpful when using the revolver outside of infiltration, as there are plenty of flak type enemies, and Monstrosities count as unyielding, so anything extra to deal with them is perfect.
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Curios are really flexible, with only a couple perks that really benefit builds. In this case, Toughness can be substituted for Health if required, but Toughness is still recommended. You might want at least 1 Curio to have 1 Wounds on it, wounds increase the amount of health bars you have. This is beneficial, especially on higher difficulties, as it allows some leeway if mistakes happen, or you get overwhelmed.
Stamina Regen is really important and should be the only modifier you go for one each Curio you use. Lastly, for this build, having an increase uptime of your infiltration ability is the main goal. The more you can go invisible, the more you can make use of your most important ability to do a range of things in the middle of a fight.
Breakdown of skills are shown below