Squishy Void-Sniper
 Psyker Build - Warhammer 40k: Darktide 

The build's idea is to snipe 'n' support team from gunners, elites and specials. High mobility gives an opportunity to give yourself a safe distance from the frontline chaos. It will also help the team to not to worry about "backstabbing" trappers, and other specials. Be wary of your own safety though, because you will be the squishiest little plushie for the Nurgle. 

Combat Ability regeneration through Psykinetic's Aura, Seer's Presence, and curios will help to get rid of the weaker mobs, and maybe stun some annoying ragers or gunners from attacking. Staff's Primary attack will also increase this build's effiency whenever there is too many enemies to worry about. Charging the slow void-ball is always a risky move, because it doesn't guarantee any stuns. Its damage output is also quite bad when charged less than 50% of the bar meter. That's why it's sometimes better to just shoot from the primary attack or run away with the knife.

The knife is just to get out of from sticky situations, kill dogs, lonely mobs and muties fast, and suppress enemies from escaping. Aggressive playstyle is a must for this build to flourish. Without any forethought, enemies will pin you down faster than you will get the time to say 'God-Emperor'. That is because this build builds up tediously toughness through Peril Quelling, and High Peril is also the main source of our damage input. Soulstealer would in the other hand be a good addition for this build, but the build would lose 15% of Venting Shriek's cooldown reduction. 

As always, a build is a guideline, not a law. Many builds are better, but this has pumped up my dopamine quite a bit for the High-Risk, High-Reward playstyle. 

TL;DR: Sweaty Voidknife-Rat Psyker kills elites and specials fast and furious.