Harder Better Faster Stronger-Auric Maelstrom
 Psyker Build - Warhammer 40k: Darktide 

In the grim darkness of the far future, there are fast Psykers, running and slashing, in the Holy Emperor name.

This build is good on Auric and Auric Maelstrom, where there are a lot of enemy ogryns, and moving fast can help keeping up with your Arbites and Zealot friend that smash everything on their way; i can't go higher than Havoc20 but higher than that, i think the energy Shield is better than the Scryer Gaze.

For the primary weapon, I much prefer the Combat Blade than the Dueling Sword, since it can easily deal with hordes; Lacerate help you deal damage to Ogryn and Mauler when getting distance to charge the staff is not an option, and it's good DPS against monster when you can't charge your staff or brain burst. Uncanny Strike is pretty self explanatory, and the +25% flak and +25% Maniacs make doable killing gunners, shotgunners, flamers, mutant and ragers pretty fast, and when you're surrounded you can can just start slashing with the blade using Scryer Gaze and push your way out even of mixed hordes; when in Scry gaze like this, always try to get weakpoint kills to activate By Crack of Bone. With a +12% block and Kinetic Deflection, you can tank Mauler and Ragers, and even Plague Ogryn and Chaos Spawn for a while, but you're not made to kill monsters, so it'll be not easy to kill it alone.

For the secondary weapon, the Voidblast is a really good all-rounder: you can spam the primary into enemy far away to dwindle their number, but most importantily with the charged attack you can make Ogryns falls, and it's the most important thing to do when an Ogryn squad appear: start charging and drop them to the ground until they are dead. This is why Carapace and Unyielding Damage are so important, like the Reding Shockwave and Warp Flurry, so that you can really start chaining the charge fast and hit hard. If there are really a lot of enemies on screen and you're at max peril, just activate Scry Gaze and go on chaining explosion with Warp Unbound until everything, hopefully, is dead; if you're surrounded by enemies too big or too numerous for the combat blade, you can just charge the center of the explosion at your feet and make yourself room to switch to blade and run away.

For the Blitz, with the combat blade deleting hordes so fast and the Voidblast melting elité squad, the Brain Burst is a pretty good choice to kill sniper and and shooter far away, and once you kill one you can start chain killing them thanks to Overpowering Souls. Empowered Psionic seemed like the obvious choice, since without it Brain Burst is actually lackluster, and with Scryer Gaze i don't need the Toughness regen and cooldown debuff of Warp Siphon.

For the Curios, i don't feel like a Psyker with a combat blade need extra Stamina, and one +21% health help with the low survivability of Psyker, but +3 Stamina is a valid option to be really be able to tank with the combat blade; the x2 20% gunner resistance is really important, but remember it help only against the Scab and Dreg Gunners, not Shotgunners nor the non-specialist gunners, that are still a menace at Auric.

All in all is a pretty well rounded build, with only Monstruosity being hard to deal with, but that's usually Psyker for you. You have to run fast, almost constantly dodging(just learn the rythm, with the stamina regen of Psyker you can slide indefinitely), and stay with your group doing what need to be done: Ogryn dealing with an Ogryn squad? Kill the gunners shooting at him with some well-timed Brain Burst. Team dealing with a plague ogryn? Run around the big monster and kill the incoming horde, topple the mauler squad and when you have time, help dealing damage. Help your team making sure the team is not in a bad position, and no heretics will be able to stop you.