Flensing Command
 Skitarii Build - Warhammer 40k: Darktide 

Preface:

I've seen a lot of builds for Noospheric Command not pick an ability because they don't think they'll use it, but you can leave that mindset at the door the nanosecond you pick up Flensing Protocols. Not only does Noospheric Command give you insane uptime on flensing stacks, but the capacitance gen you gain with Higher Purpose eliminates the dilemma of using your ability vs command. Voltaic Emitter ends up being the ability of choice due to both its location on the tree

Emitter is a crazy good offensive pick even without any modifiers, and is probably the best 'oh shit' button available to the Skitarii.

Anecdotally, I find myself back to almost a full charge in 2 seconds after blasting an Emitter disarm into a pack of shotgunners and then resume using Command continuously

Onto weapon picks:

To start, we have a CYoA when it comes to our weapon picks due to Noospheric Command, Skitarii is especially spoilt for choice on melee picks.

My favorite melee for this build is the Catachan Mk VI Combat Blade. Electro-Strike Conduit allows us to use our massively boosted crit from Riposte to stack brittleness on bosses and ogryns, and bleed from Lacerate really starts stacking when you have burn DoTs.

For some other excellent picks, you can go with Catachan Mk VII "Devil's Claw" Sword for parry enjoyers or Munitorum Mk III Shock Maul for great stuns and more easily stacking brittle.

Branx Mk VI Mechanicus Power Sword, Branx Mk III Arc Maul, and Branx Mk XI Paired Transonic Blades aren't my favorites because I don't really care for the movesets or blessings, but again the weapon choice for this build is extremely flexible.

For our ranged option, I am partial to the Branx Mk XI Phosphor Blast Pistol. 15% extra brittle and 16 (for some reason) stacks of burn do wonders for boss and crusher damage. Adding on the ability to take out maulers and ragers before they get to youmakes for great QoL

Otherwise, the Branx Mk IV Arc Rifle is probably your best bet. Both Phistol and Arc Rifle are extremely powerful to the point of overshadowing other ranged picks on the class especially when you take into account the ammo modifiers on havoc. Ideal blessings would be Charmed Reload and No Respite. No respite scales with the tier of stagger/stun you inflict on an enemy, meaning it does a metric ton of damage when we pop a t2 Emitter into a crowd.

Curios:

Skittles really love toughness, nothing else really competes, maybe an extra wound if you desperately want it.

Ability gen and revive speed are pretty mandatory, I will die on the res speed hill and you can feel the difference of not having a 12% ability regen buff when it gets spent so quickly. 

Toughness regen is kinda weird but also pretty amazing now with Resurgence, a most wonderfully interesting aura. 

Swapping out for a single gunner resist is a decent pick if you feel desperate for it but Command is there to solve that problem, you could also go with corruption resistance for Ablative Wards tomfoolery and never have to worry about corruption again.

Perk Nodes:

This build comes with some flexible perk points; Shockline Breach Protocol and Adaptive Combat Calibration are both easy swap-outs if you feel like you don't need all the cleave. 

Notable alternate picks:

• Ablative Wards - havoc modifier begone
• Voltaic Motivator - Emitter modifier for even more melee attack speed (lovely to have on knife)
• Ammo-Cell Augury - cancel out havoc modifier, esp good if you swap for Arc Rifle
• Overcharge Transfer Lattice - mini Emitter stun every 15s, good for making space when getting swarmed

Notable exclusions:

• Purgator Servo-Skull - fight me
• Enhanced Capacitance Protocols - noospheric command solves this problem already
• Capacitor Reclamation Loop - Flensing leaves us with enough generation to not need additional capacitance nodes
• Power Overload and its nodes - the capacitance generation simply isn't enough to justify using Command, and you start to feel the lack of crit chance pretty hard.
• Residual Current Buffer - really needs redline to work and we use Emitter often enough that it becomes just a 10% toughness DR.