The Sanctified Shiv - Stealth Assassin Build
 Zealot Build - Warhammer 40k: Darktide 

Stealth Zealot Build - "Prayer may cleanse the soul, but pain cleanses the body."

• Knife for backstab and general horde clear through bleed stacks - Blinded by Blood, Flesh Tearer paired with the high crit rate allows for hive scum level DOT kills on mixed hordes. No last rites, no warning, the tenets don't call for a witness.
• Boltgun for heavy armor packs - toss a throwing knife mid animation to skip the lengthy change to bolter. Shattering Impact allows for effective crusher damage and Puncture for boss damage. mainly for full auto use stealth to deal with gunners to save ammo. For when the quiet approach isn't enough, the transition to open violence is instant and you better have spare ammo!
• Master-Crafted Shroudfield and Time to Kill allow for easy one tap backstabs on lethal threats such as crushers and bulwarks, use for this, a get out of jail free card and to revive the team!  
• Blazing Piety for more consistent knife DOT.  Stalwart paired with Invigorating Revelation makes you a very safe even in a pack of Crushers, armed with nothing but a fancy shiv and a conviction that the wound always outlasts the fight.