Melee Scriers
 Psyker Build - Warhammer 40k: Darktide 

Enemies

Horde: Greatsword light attack spam at head level. Greatsword special when charged.

Dreg Rager / Specialists / Ranged Enemies : Vraks Mk V Infantry Autogun

Scab Mauler / Scab Rager : Greatsword heavy attack to the head if numbers are managable, if not, Autogun mag dump; body shots for Scab Mauler and headshots for Scab Rager, to hit the Flak part.

Crusher / Reaper : Greatsword Heavy overhead spam at their heads while dodging as needed

Bulwark : Force push to stun then push follow up attack for kill

Monstrosities : Activate Scrier's and unload ranged wepon clips into their weakspot. This gun does insane boss damage.

Captains : The only enemy type against which we are not that great. Spam melee light attacks to their shields and heavy when they are exposed.

Playstyle

Use Scrier's Gaze as it comes off cooldown. Mow down Disrupt Destiny targets with your ranged or melee weapon; preferrably weakspot kills for Cruel Fortune.

Be mindful of your remaining ammo and favor melee when you have 2 clips left (around 100 ammo).

I never actually use Brain Rupture with this build because we are not a caster and we don't have time to sit idly and cast spells; it's just there for the free Kinetic Flayer kill every now and then which does its thing whenever it comes off cooldown and is actually very useful against Crushers and Bulwarks.

Always be on the move with the insane speeds you get with Disrupt Destiny, Scrier's Gaze and Mettle, to evade and aggress the heretics.

Tested consistently on Auric Maelstrom where I pretty much all the time got the highest numbers across the scoreboard (horde/specialist/elite/boss damage and kills) in all categories by a huge margin compared to teammates (x2 - x4) by just being extremely aggresive and mobile.

/!\ The second big force push with the greatsword generates about 4% Peril when it makes contact with an enemy. Be careful not to overload with that.