Sharpest tool in the shed
 Psyker Build - Warhammer 40k: Darktide 

staying at max stacks of Disrupt Destiny should be no problem with this if you play aggro enough.

Peril Equilibrium can be swapped out for Kinetic Deflection , I prefer equilibrium because it suits me more. the main goal of either is to passively keep your peril as high as it can be in order to get the most out of Warp Rider , One with the Warp , Warp Splitting  and Quietude 

for the Scrier's Gaze setup here, I like taking Warp Speed  because I find the movement speed boost flows really well into the attack patterns of the sword, but if that's not for you then the perk can be reallocated back into Malefic Momentum . 

for the Covenant Mk VI Blaze Force Greatsword , you want to be using heavy attacks as often as possible. the pattern chain will give you a nice boost in TTK power. light spam is fine for Groaner or other chaff hordes, but going through the overhead heavies into the thrust while aiming for weakspots will ensure minimum 3 shots on maelstrom Crusher (dependant on peril levels)

also for the sword - Warp Splitting is crucial because it doesn't have a lot of base level cleave potential. this setup works well in 1v1 and against groups of elites or armor as long as your movement is good - but the worst thing is to get backed into a corner by dozens of chaff units without being able to cleave through them all super quick. 

final point - the +3 stamina curio can be swapped out for a toughness curio with the same perks, I've run it both ways just pick whichever you prefer.