Perma Dash, Bleed and Crit
 Zealot Build - Warhammer 40k: Darktide 

So the core of this build is that you cause bleeding to literally everything all the time, causing you to get insanely tanky while you can spam your dash whenever needed as every crit reduces your cooldown.
In essence, this build allows you to be wherever you are needed, quickly going from front to back, being able to pick up allies while using a stun grenade to ensure you can revive them uninterrupted while also slaying monstrosities and elites with weak spot crits and tons of bleeding.
This build requires a bit more understanding about your positioning as your angle of attack is usually tighter and shorter than that of an Eviscerator or an Energy Hammer.

The Revolver can be replaced with a Laser Pistol or really any precise firearm, I personally prefer the quick draw time of the Laser Pistol and Revolver. 
Your firearm simply serves to take out ranged Elites like Snipers or Gunners when they are outside of your Dash range. If played well your ranged weapon is a rarely used tool, so pick what you feel comfortable with.

If this build is played correctly you become near unkillable and have a level of mobility unrivaled by anyone else while also bringing a lot of utility and safety to the team, easily able to run any difficulty the game has to offer at the moment.