Skitarii Noospheric Overload
 Skitarii Build - Warhammer 40k: Darktide 

This is a Havoc 40 ready build.
Your job is deleting Elites and Specialists. You can flex into horde clear with Voltaic Emitter and your Arc Rifle, but will need to watch your ammo consumption.

Notes:

• We're building around Power Overload and Noospheric Command spam.
  • Critical Power Overload is a great damage buff. Incoming damage debuffs on enemies are calculated a little different than simple personal damage buffs, and thus more desirable.
  • Invigorating Overload is a great way to help your team's survivability, and triggers frequently in Havocs.
  • Static Capacitor Drain is a straight forward buff, but note that if you die, you'll have to start regaining those buffs from scratch.
• Voltaic Emitter
  • You're not going to ability spam on this build, but it is worth noting that the extra range from putting 1-point into Voltaic Emitter gives it a much better range which translates to more efficient horde clear when used.
  • After the recent update, using this once will insta-kill a Heinous Ritual. Not sure if this is intended, but it's nice.
• Artificer Servo-Skull provides great utility, and enough damage by itself that I have no interest in Arc Grenades or Integrated Refraction Emitter.
  • Medicae Servo-Skull will save runs, and help carry less experiences teammates through Havoc.
  • Purgator Servo-Skull is useful if you abuse entity cap by rushing missions, and are forced to fight a great number of enemies all at once. Outside of that use case, it's a waste of shared limited resources.
  • Noospheric Command is great, but I don't use it for this build. I find that my Phospor Blast Pistol is enough to deal with specials, but you wouldn't be wrong for choosing this.
• Foe-Render Creed is the best Aura.
  • Ammunition Deposit is straight forward in how little it provides.
  • Resurgence is a trap, and should never be taken in Havoc.
    • Resurgence drops your Coherency Toughness Regeneration by 50%. That debuff stacks with hidden Havoc modifiers.
      • Havoc 25+ drops it by 40%.
      • Havoc 34+ drops it by 50%.
    • Resurgence, provides ~1.87 toughness/s in full coherency, without TRS Curio perks.
    • Resurgence, provides ~3.56 toughness/s in full coherency, with 3 TRS Curio perks.
    • Resurgence, provides ~5.44 toughness/s to an Ogryn running Lynchpin in full coherency, with 3 TRS Curio perks.
    • Keep in mind, the above are NOT percentages and represent the best case scenario.
• The Paired Transonic Blades are pretty good.
  • The good Critical Hit Chance and fast attacks means you'll be apply electrocute and brittleness to enemies often.
  • Spamming heavies makes you run faster.
  • I sometimes run the Mechanicus Power Sword instead, it's a great alternative. There are other options that work on Skitarii as well, but I feel they require a longer explanation on how to make them work and I'm not currently inclined to do so.
• The Arc Rifle is an extremely good ranged weapon.
  • Useful for clearing mixed horde, and deleting ranged threats in general.
  • It falls far behind Chord Claw in boss damage, but the boss numbers this build puts up are still respectable. Assassination Protocols really helps in this respect, as it double dips against Plague Ogryns.
• Overcharge Transfer Lattice is an underrated survivability node. However, I think dropping it for Retribution Conduit makes a lot of sense if you're trying to squeeze more damage out of the build.