Head Poppin' Rock Boppin'
 Psyker Build - Warhammer 40k: Darktide 

Any high damage single shot weapon works, but the revolver is king in this realm, with it's huge rending and guaranteed crit, you're going to be making a lot of damage suddenly pop out, especially since the "True aim" works for each and every headpop you make, get 5 headpops? that's a free crit for your next revolver shot! just gently graze a poxwalker's head with your melee? add that to the counter. It's free crits for a gun that already instantly kills most things. Enjoy it. break some armour.

the illisi is there for crowd control as needed, but anything really works to your flavour, I prefer the ability to generate peril off of it, but if you have the need for something like an axe or a knife, then go for it!

step by step? you're going to be brain bursting EVERYTHING. with 125% faster charge time and a higher damage cap, you'll be popping brains like no tomorrow, and because each kill gets you closer to being able to shriek again, you can really go far. 

I recommend you try to generate as much peril as possible, because it's hard to generate peril with this build sometimes, and you'll want it for the flames, which will burn everything and anything around you, ticking away gently at health bars and making breakpoints for  the headpop much easier to reach without worry. and trust me. you'll be mowing through people with this.

Have fun. Aim for the head.