Havoc Ready Chorus Knife Flamer Zealot
 Zealot Build - Warhammer 40k: Darktide 

Push attack gives you Melee Attack Speed. Hitting an enemy adds bleed stacks. When you dodge you get 60% Finesse Damage, which stacks with the 15% Damage Increase from hitting bleeding enemies. With Blazing Piety you just wanna go ham and crit as many things as possible. With your Finesse Damage on Dodges, you're gonna be absolutely pumping out damage.

If a boss happens to stand near a ledge, use Chorus of Spiritual Fortitude to knock em off! Also, Chorus of Spiritual Fortitude should be used OFFENSIVELY to make sure your team captures the next room/area. Only use it for defense if your team needs to fall back but can't because of the Specialists all over the place.

Whip out the Flamer for hordes and to add Brittlness to Carapace/Bosses.

The Dagger can easily be swapped out for the Dueling Sword IV. Take Uncanny Strike and Precognition , Riposte , or Thrust depending on your playstyle.

The Flamer can easily be swapped out for the Locke Mk III Spearhead Boltgun . Take Pinning Fire and Puncture  or Cavalcade depnding on your playstyle.

Have fun!