fent devil
 Psyker Build - Warhammer 40k: Darktide 

scrier's gaze cools 50% peril, so just use smite to 50% as a free 10% health debuff + stunlock for the team, then start crit fishing for that damage, speed buff + toughness gen and range immunity, so you don't have to go for headshots while doing zooming heavy cleave bys that also take advantage of peril based rending, damage, cleave, defense buffs until peril/scrier's wears off, usually in time to repeat smite  then quell again. Warp unbound lets you just spam smite for 10 seconds at the end of scrier's gaze until it auto clicks off when you're at risk of overloading

your main threat is anything restricting your mobility, so don't linger around hounds, trapper, or burster filled areas, just run around the periphery, in and out of cover, while avoiding getting caught. your speed does make you ideal for objectives, rescues, resource collection, and assisting the team. if you are ever cornered, the push stab spam move often blocks/staggers incoming attacks though it does require stamina.

you can probably switch to any gun you want, though probably want one that can handle far off specialists and bosses. Empathic Evasion lets you defend against massed gunners by shooting them back.

the cooldown reductions from elite kills especially does tend to mean you'll be in scrier's gaze at least 50% of the time, so just pop it whenever you have peril to quell, or about to spray down a hoard