Shock Arbitrator - H40 viable
 Arbites Build - Warhammer 40k: Darktide 

Build Overview

• A durable frontline build focused on crowd control and survivability. It can comfortably handle hordes, specialists, elites, and armoured enemies, while not dying.
• Open every engagement with heavy attacks from the Branx Mk III Arbites Shock Maul. Against groups of three or more enemies, use a push attack to activate Drive them Back and Hammer of Judgement, then chain light attacks to keep enemies staggered. Don't worry about keeping Hammer of Judgement up because it will be.
• Use the Exaction Mk III Exterminator Shotgun to quickly deal with groups of specialists or elites. Send the Cyber-Mastiff after distant snipers or bombers. Against heavily armoured enemies, keep the dog close and use its Remote Detonation for stagger and nice damage. Dont forget about the shotgun special to electrocute enemies.
• Stay at the front and control the enemy's advance. Hold choke points, create space for your team, and keep enemies staggered whenever possible. Your job is to be in the thick of it and keep enemies from attacking your friendos.

Regarding curios, stamina and True Grit 

Meet the breakpoint of having "two" of True Grit with the curio setup above. Corruption resistance will be important in higher difficulties on Havoc and will also prevent you from being obliterated by a stray poxburster. 

Gunner resistance is quiet important because when you need to charge in or cannot position yourself well the gunners will be one of the larger threats for you. 

I usually always put down some block efficiency or stamina regeneration but Rapid Movement helps instead. For this build stamina is VERY important in prolonged fights or if you are going to clutch. 

Variants

• Some prefer Razor-Jaw Augment.  Do not pick it,  it is shit. If you do not believe me: Try it out and see what kind of "damage" this talent does to hordes, elites/specials and armored. Also arbites has no other talent or blessing that synergize with bleed. 
• Switch around points in the lower right three. 
• Some go left and use Zealous Dedication and Soulguilt Scan. They are not bad. But I find other talents in the right side that I rather have. 
•  No Escape can be fun/useful depending on your playstyle.