Resilient Crit Zealot
 Zealot Build - Warhammer 40k: Darktide 

This is similar to the ZeCrit build, but with more focus on defense. In a horde, you'll be able to regenerate Fury of the Faithful charges within 5ish seconds, which means you'll consistently have max or close to max toughness and extra attack speed. Extra toughness blessings (~15-20% per curio, usually) can boost your resilience even more, since you won't take any health damage until your toughness falls below 100. 

With Shred and Scourge at max stacks and Blazing Piety active, you can easily break 80% crit chance. This'll keep your toughness damage reduction procced and your combat ability available.

Even if you end up surrounded, Until Death makes this build much more forgiving. As a result, it has great clutch potential and enables big, flashy, high-risk-high-reward maneuvers that can make the game that much more exciting for your whole team.

The quick-draw revolver is great for picking off specials or the occasional sniper that your team isn't prioritizing, and your throwing knives give you an excellent, blazing fast option for killing specials that are just out of reach.

Replacing Wrath with Savage Sweep is a good choice and totally a matter of preference. I prefer Wrath because you can start cleaving through elites after a couple light hits if you want. Alternatively, you can dial up this build's tankiness even more by replacing one of the cleave blessings with Momentum if you like. Obviously, this will sacrifice some speed when clearing hordes, but may be worth it. You can also tweak the build to have a different combat ability; the cooldown bonus from your crits will still apply. Happy Heretic Hunting!