Speed Zealot
 Zealot Build - Warhammer 40k: Darktide 

A fun zealot build which allows you to ZOOM across the battle field, dodging your way out of danger while being able to help your allies with anything. I tested this build on Auric Maelstrom and it performed alright, albeit it is not optimal.

This is also a fun build which can easily do Find their Weakness if you are struggling to get it. Basicly throw a granade into a horde and charge them, spamming light attacks. 1-2 mission max.

Weapons

Melee: Either knife variant is fine although I found myself gravitating toward the MIII Combat Blade since of its Heavy Attack pattern feels more natural with this sort of build where you go in and out of combat.

Range: I used revolver, bolt pistol and the bolt gun on this build and found that depending on the team or your choice of melee and skill with it, that all three preform great. 

Revolver is fun if you have a keen ear since given your ability to put space between the enemies, it is beyond easy to pull out the revolver and 180 all specialists except mutant.

Boltgun is a chunky piece of blessed metal which shred monstrosities even without a dedicated built in addition to serving as a horde clear machine if ammo allows it. 

The bolt pistol is a combination of the two, excelling at nothing but being versatile and more lenient on ammo than the revolver but slower to draw/aim.

Why stun grenades? They are like mini Chorus. Your team mate is surrounded by a horde, No problem just trow one on top of him and you will be fine. A line of gunners shredding the team? Throw a grenade at them! (Or charge them since you barely get hit by anyone)