Havoc Smite-Scrier
 Psyker Build - Warhammer 40k: Darktide 

Your role on this build is to support teammate killing boss

In current Havoc they spawn multiple boss and elite hoard 
Multiple boss mean you need to kill them quick, so mission won't fail, but hoard keep coming and boss killer cant focus on boss.
You smite the hoard so other players can focus on killing boss, but normal smite won't CC then long enough, so I use "warp unbound" to extend smite duration.
Some enemy you cant CC them, so I put more damage on smite as much as possible, so that you either kill them or reduce their health enough to kill them in 1 or 2 hit.

weapon of your choice, but I recommend long rage so you can kill them from far away
------------Range ------------
-- EK staff -- : so I can get benefit form critical stats. I mostly use only primary attack because it's quicker and I dont have enough time to change while fighting in the hoard.
-- Void Strike Staff -- : secondary chage can kill enemy in line if you have a good placement, but most of my time damage isn't enough to kill the hoard even with fully charge.
-- Void Blast Staff -- : I haven't try it, but it should work fine.
-- Flame staff -- :  I don't use it often because it's redundant with smite cc + you can kill enemy far away.
-- gun -- : It work really well, can deal a lot of damage too, but ammo is scarce. Not my choice
------------ Melee ------------
-- Dueling sword -- best anti elite but struggle with hoard
-- Great sword -- since I use staff most of the time with high peril I "unstable power" to boost it damage.